Engine was a 400 Pontiac running reworked 428 big valve heads, Sig Erson cam.
In '79, added a '66 tri-power intake modified to mount larger 440 Dodge 6-Pack Holley carbs. These were the performance replacement carbs sold by Dodge dealers over the counter to replace the factory installed vacuum secondary carbs. These carbs had the smaller square fuel bowls and unlike the OEM tri-power, all 3 carbs had metering pates and accelerator pumps. Essentially, it was the same as a mechanical secondary 4bbl carb versus a vacuum secondary 4bbl, except that in this case, the 2 end carbs acted as mechanical secondaries and each of them were 500 cfm, whilst the primary center carb was 355 cfm (1355 cfm at 2bbl rating or 958 cfm at 4bbl rating).
After these photos were taken...... Solved a fuel starvation problem when the end carbs were kicked open...... Pulled the fuel lines to the carbs and made up a long fuel log from 3/4" dia. stainless tubing similar to the ones used on early '60s 406 Ford tri-power engines with similar carburettors......
Ford FE Tri-power
...... And replaced the 5/16" fuel line from the fuel tank with 3/8" along with adding a 3/8" fuel pickup and float assembly for a '57 Chevy dual quad or FI engine. Retained stock Pontiac mechanical fuel pump...... No more fuel delivery problems.
Happy Motoring,
Harry
) Imo its around 300/320hp. This would be in the average vehicle with rear mount tank and all the twists and bends associated with that and running only a stock type mech fuel pump typical to most early carbed V8 engines. 
