Here’s my low compression 9.5-1 440 that pumped out 525hp and 545tq and it’s stock enough that you could change the cam and valve springs then install it in a motor home.
I built it back in the mid eighties and followed the Mopar engine book. So it has the 1.81/2.14” valves, I did the pocket port on the heads along with cutting them to 80cc for a true 9.5 cr.
Pistons are heavy forged TRWs. And if I remember correctly it has a .557 lift mechanical purple shaft. So you don’t need to spend big money on parts to make decent power you just need to make sure all the parts work together.
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