Popular hot rodding has a 477 hp 318 in it that looks like it would be sweet motor. Peak HP was at 6500 (may have made more past that but thats as high as the test went). It made 427 lbs tq to boot and it used iron heads

I have been gathering parts for a stroked 340 for my 68 cuda but I have a real nice 318 short block in there now with SCAT I beam rods and KB167 flat tops to make it nice and light, I am thinking about porting some RHS Iron magnum heads I have and throwing them on and running it that way. Mine would probably be a touch less hp because I have a little smaller cam but I have the parts so I might just do it.

PHR says the build is on there site but I can't find it