Disappointed with my engine

512Stroker said

You answered your own question "**** J heads".
Dont know what your CR is but that cam is too big for those heads.
Are the heads and intake ported?

Click to expand...

Just port matched and tidied up aroind the pushrods. I can't believe the stock heads will only support 300 hp? I raced Fords years ago and all we did was tidy up the roof of Clevo heads and good to go!