That car would fly with a set of Iron Oval port heads.
Before you think i'm nuts, take a look at my friends car:
here's the combo:
BSE Big Block
454+ .060”= 467ci
-Wiesco closed chamber style pistons with Speed Pro Plasma Moly file fit rings
-11:1 CR
-Clevite bearings - mains, rod and cam
-Fel-Pro gaskets
-Crower Sportsman rods and Crower 4340 crank with ARP main studs and GM windage tray
-Moroso 6-Quart kicked-out pan # 20401 with pickup # 24440
-Melling oil pump high pressure
-RollMaster billet double roller timing chain
-#215 closed chamber oval port heads '67 - '68 with 2.25 / 1.88 Undercut valves 11/32” stem, valves Unshrouded, gasket matched and bowls blended (valve job angles 30/45/70) *note* head work done by Richard Biebel Racing
-Performer RPM Air gap rectangular port manifold
-Pro-Systems Pro Series 4150 "1000HP" downleg boosters
-1/2” 4 hole spacer over ½” open spacer
-GM carb heat shield
-LSM billet roller: 254/260 dur. .720"/.720" lift 107LSA 7/4 2/3 firing order swap comp #933 springs (Coated). Crower severe duty lifters
-Rocker Arms- Crane Gold Race 1.7 rockers
-3/8" one piece pushrods
-MSD ignition- 6AL box, blaster II coil and Pro Billet distributor
-Headers - Dynomax 1 3/4" PRIMARY TUBE with 3" collectors. Remove collector weld on Flowmaster Scavenger Collectors # C-134214300
-3-1/2" head pipes with 3-1/2" X-crossover and 3" dumps after mufflers. All bends to be mandrel. DynoMax Oval UltraFlo mufflers
-Mallory Comp 140 fuel pump, regulator and filter plumbed to stock 3/8" fuel line.
-Mobil 1 0W-20 oil, Ford type F trans fluid and Mobil 1 gear lube
-indexed spark plugs
With a turbo 400 prepped by STR, 8” ATI Treemaster converter, CSI Super Sheild, Stock Horse Shoe Shifter 4.10 gears and either slicks or DOT slicks this combo will run 10.40's depending on weather, tuning and driver Best: 10.37 @ 127.2 mph with a 1.35 60ft off the footbrake, through the exhaust at 3860lbs
-Delco 94 amp alternator with internal regulator #10495426 and a Delco battery Group24 #78DT/84
-Denny's HD aluminum driveshaft 1350 U-joints and yokes
-ATI balancer
-My 1000 HP is not a box stock piece but rather custom built by Patrick James at Pro-Systems and was worth .06 and .5MPH over a "out of the box" 950HP.
Jetting as delivered is 88/94 with a 2.5 PV in the front and .035 squirters.
It's deadly with 86/92, 2.5 PV and .040 squirters and often runs the same number back to back varying only thousands at every interval.
It will run quicker and faster with 89/95 in GOOD air.
-Timing: With my closed chamber/piston combo 36/37 produces the best MPH and I've run as much as 44 yielding quicker 60 foots.
-15" x 10" Weld Pro Star wheel 5-1/2" backspacing. 12.5" section width on the tires 30" tall MAX. C07 Hoosier Radial slick 30” x 10.5”
-Koni Street adjustable shocks set full stiff rear/full soft front
-Alf Weibe stock eliminator rear suspension w/ control arm braces that triangulate the control arm mounts
-Front springs are Moog 5392 combined with Koni Gas shocks set at full soft and poly graphite bushings set without any preload. The front sway bar has been removed
-front springs Moog 5392
17.95".......................Free height
11.50".......................loaded
266 lbs./in..................rate
.61...........................wire diameter
2026.........................total load
Front/rear weight bias = 59/41
only .06 slower with an out of the box Holley HP950
If the Iron oval port is not for you, then take a look at Pro Filer oval port aluminum cylinder heads. they make one in 290cc which is on the large side for your application but a much better choice then the cylinder heads currently on the car.
http://www.profilerperformance.com/bbc-heads-174.html
You can still street drive the 8" converter, as long as its an ATI treemaster.
I like the 10" ATI treemaster and it would work well in your application as well.