[olddog]

As said by cycleguy55, if the heads are limiting the power of an engine, stroking the engine gives no gain in power and causes the torque to happen at the lower rpm by the ratio of the displacement change, as I stated earlier.

If the displacement you have and the cam are pulling in all the air of the displacement or more (100 - 100+ efficiency), then stroking the engine will give a huge hp and torque gain.

Your heads are likely somewhere between the two. If I am correct the dyno sheet of your engine has 440 ft-lb peak torque at wheels, which should be in the range of 525 at the crank. That is likely over 100 efficiency with torque being 1.5 times the displacement. So I think the porting on your heads is very good, and likely would do better with a stroker.

AFR are top notch heads, but yours could be as good or better depending on the port work.