Novice question here. Since power expected is modeate at 650 hp out of 500+ cubes, why not consider a STEP BACKWARDS? The thought comes to mind that the bbc motor uses a smaller lifter for power levels above what you seek. If a block needs repair work, total cost would also include the added (if any) cost of special size lifters. I am assuming hi quality bbc roller lifters would be cheaper, and readily available should you ever need a replacement. At 650 reqiured power level, a rather mild roller profile and modest springs will make for a long life motor.

Not a bad idea BUT ... you can't just take a Mopar roller cam and run it with Chevy-sized rollers and expect the same results. The specs will change everywhere in the cycle except at the baseline and max lift. You would need to have a cam ground on a Mopar blank with a Chevy profile to accomodates the different size lifter wheels.

hemienvy, did you go down the .937 lifter path? Does anyone else here have experience doing this?

I've got a B block 512 going together and the factory bores are 0.9063 to 0.9071.
Many of them have taper top to bottom and slightly out of round.
I've heard, but have not been able to confirm, that BAM will make oversize on request.
I'd have to have the lifter bores trued up anyhow so why not go to an off the shelf size versus custom.
This is a street/strip build to hit about 650 HP, solid roller cam.
I like the idea of not removing so much metal to fit a bushing.
Would plan on using a lifter with edge orifice oiling with the hole parallel to the oil galley.
I can set up the block for full time oiling with modified passages, or go with PR oiling.