FlatTappet vs Roller cam comparison: XE256H vs 264HR

[BigBlockMopar]

I'm wondering how 'different' the following 2 cams will be compared to each other (idle & midrange power) in a street engine with a 500-5000rpm range?
One is a hydraulic flattappet XE256H, the other is a hydraulic roller 264HR.

The XE256H is currently installed in a Mopar 360ci with 11.3:1 CR running on propane. Lifters are converted to solids and currently running it tight-lashed with 1.5 rockers. Might go to 1.6 rockers.
The heads are small '302' ('80s 318ci) iron heads, smoothed cambers/ports, stock, (but backcut intake) valves. Megasquirt ECU ignition control / IMPCO Carbed fuel system.
Besides a valve guide issue which shows up at idle, the engine feels strong at just about every rpm-range upto 4500rpm.
The small port heads are probably limiting the engine to rev much higher.

Both cams duration at .050 seem very close together, but their adv. duration @ .006" are more apart from each other.
It's not mentioned on the card but I wonder if the roller would have some 'lope' in the idle?

(The XE256H camcard is spec'd with 1.5 rockers. The 264HR camcard is spec'd with 1.6 rockers.)

[cjperformance]

Go for the 264, quieter running and a lift advantage. Still perfectly smooth (smoother on LPG ).

[gmc406]

Why the “computer controlled” cam? Are you looking for the wider lsa?

[BigBlockMopar]

To be honest I can get this still new 264-roller cam for a good deal, at half its new price.
Of course I know this is totally not the way to be picking a cam, but since it soo close to the specs of the current tappet-cam I'm running, I was wondering what if any the changes would be.

Also, I have a mid '80s factory rollercammed 318ci, which could benefit from a nice upgrade if I won't use the cam in the 360ci.
The 360ci would need rollerlifters, pushrods and intermediate shaft, while the 318ci wouldn't need anything to change to this cam.

[BigBlockMopar]

I learned the guy I was supposed to buy the cam from had already sold it to someone else, so if there's a roller cam to be bought anytime soon by me I will at least get one that's custom ground and works with the engine better.