My main reason for not messing with the bottom end is there are no shops anywhere near me i trust to do any of the bottom end work on it without douching it up.
If there’s no one you’d trust with the basic machine work, who would you trust to port and/or do a valve job on your stock heads?
To make 400-450hp from a 360 magnum, you’ll need a cam that will require a valve spring change from stock.
The old MP crate motors hit 380+ hp. 9:1 compression with M1 single plane intake, and 750 Holley carb. Lots of duration, not much lift so they could use stock rockers.
