Another, Damn it, horsepower guess ??
wouldn't the roller give you better rev capability less resistance etc?
Yes but solid roller cams come with two main caveats - generally, the profiles are usually designed to work for higher rpms so the rest of the combination needs to match it or it won't work very well and #2, roller cams require much stiffer valve springs which puts more strain on valvetrain parts. All your stuff needs to be beefy enough to accommodate the higher spring pressures like thicker pushrods, good retainers etc. Unless you re drag racing the car regularly, a roller might not be worth the expense/hassle on the street. One could probably get the desired characteristics from a solid flat tappet.
Truth be told, solid cams rev pretty well. I had an Mopar .528' cam in my old 340 combo and it would go to 7,000 rpm
in an instant. Drag racing it shifted 7,200. No low end torque though even with a 4.10 gear, needed a minimum 4.30 to get off the line efficiently. The O.P. has a slightly different configuration with the stroker so by default it will make more torque at a lower rpm.
if the O.P. is stuck on a roller cam, perhaps a hydraulic roller would work in this situation. The rpm range will be lower and should make more torque at a lower rpm but would likely give up some top-end hp.
