Most hyd rollers are done by 5800 good luck making 600 hp. I would think to get any real answers you need to provide more info. Heads comp ratio etc. Go on any reputable cam manufacturer web site. They have a form you can fill out and they will recommend you a cam. I'd put a solid ft or solid roller in and rev it up to 6500,7000
71 scamp 340 509 cam 456 gear,68 fury1 318 3spd on the tree,50 merc flathead 3x2 3spd w/overdrive
