You’re opening up a can of worms.
I see they’re upping the hp rating on that basic 195 hp engine up to 265. All the more is better crowd will be pleased.
Have you ever or are you prepared to break in the cam on that chunk of iron?
If not then an already run and tested motor is the best bet.
And this one is likely the best bang for the buck.
Uses a seasoned block (preferable) compared to the gm new block. Seasoned is better. Many heat cycles make for a better build platform.
https://blueprintengines.com/product...-cam-bp3503ct1