self note- from another post and your website reference
"You have to use a retrofit hydraulic roller lifter kit from one of the major cam manufacturers. They are not cheap. A lot of people like the Isky retrofit lifter kit. You can use any manufacturer's hydraulic roller cam with it. You cannot used stock GM roller lifters in a pre-'87 block."

2-bolt blocks with OEM main bolts are good to 400hp
2-bolt blocks with ARP main studs are good to 550hp

OEM 2-bolt blocks are good to 6000 rpm.

In the Article, it stated that a 250hp engine that was spinning at 7500rpm exerted more loading force
on the Main-caps than a 550hp engine spinning at only 5500 rpm. This means power and RPM must be considered
when selecting how much beef you need in your bottom end.