You can make some serious HP with a S/B.
Over 500HP is not hard to get.
BPE on here has some really nice stroker kits!
And they are very reasonable price wise.
For a steel head its hard to beat the Indy LAX heads.
I know that Bob George would be who i went through to get those.

Between BPE rotating assembly and BG top end, you basically have a motor!