Not sure if comp cams can recommend a marine stock replacement roller cam
cam spec for a stock replacement is pretty meek. thats why I dont do stock
anything over 0.420" lift, and you should run the beehive (LS) valve springs or cut the tops of the valve guides for the better seals so they do not interfere with the keepers
there is also a ghetto-grind where you grind the bottom of the keepers down, however that is a hack move
with today's issues with flat tappet cams and flat tappet lifters because the new stuff just sucks (high failure rate) its just not worth cheaping out on the cam to put a flat tappet in the motor.
the cam I spec'd is good for 320-330fwhp from the 350 with the stock flat tops and a decent intake and 4-barrel, a 2" carb spacer, its the smallest of Comp's marine cams with a good idle, etc
if looking for roller cam for a truck, the two generations are 1991-1995 TBI motors (only some got the roller and that is covered in post #1 and #2) or ANY vin code R motor from 1996-2000 (the true vortec motors)
yes, cam prices went high in the last 2 years. Comp bought all the competition that wasnt switching to LS or LT platform.
here is the stock marine cam for GM motors that was manufactured by Melling.
https://www.summitracing.com/parts/mel-22119
as compared to the comp extreme marine specs
you need SBC OE spec'd lifters. if the lifters in the pile of parts indicated in post #1 are in good shape, you could use them. (I wouldnt personally, however some people do not have issues)
if you have a stock OE roller block, you can use the cheap $10 each roller lifters
you will also need to verify the pushrod lengths as the flat tappets have different lengths than the rollers. and if the heads have non-adjustable valve train and the heads or deck were cut, the rod length changes and the push rods need to be changed.
which is another reason i dont do stock. I would change the heads to screw-in valve studs and adjustable valve train as even stock, the valve studs pull out. whome ever thought pressed-in valve studs was a good idea should be forced to listen to "helen Reddy, the las vegas years" for 2 years straight while strapped to a chair with wet leather straps tied around their nether regions