Summit cam for a 318 LA

IMHO, that approach has a lot of merit to it, and makes a lot of sense. Seems like that has been mentioned a few times and the Magnum block is a bit lower (higher inherent CR) and Magnum's have 1.6 rocker ratios and so breath better with the same duration cam (as mentioned). Not big changes, but ones that move it the right direction for better street performance (wider torque band).

FWIW, and if you don't mind, I'll relate one story of upgrading..... it is from the prior owner of my son's '65 Cuda. He had a '68 273 in it and it was a great, fun family car, for cruising, drive-ins, going for ice cream with the wife and 2 sons, etc. He built a big stoker and put that in.... and then pulled and sold the stroker, and the Cuda. His comment to us was that the stoker ruined the car for what he and his family valued it for; a family fun cruiser. When I read your comment on the 466/455HP enigne, it kinda brings that to mind. Just food for thought with that nice car.... a big engine is gonna change its 'personality'.

BTW, you can reliably do 455 HP from 466 ci with either forged or hypereutectic pistons. I've had 1.75 HP/ci on a turbo'd rally engine and both lasted fine in that use. Forged are better for surviving detonation if you ever get to that bad situation, but I have detonated holes into even forged ones .... YMMV! Forged ones run looser clearances so may or may not last as long and may or may not rattle a tad when cold, before they get up to temp.