8k rpm ...

I want to make it clear I not trying to discourage the OP from doing what he wants.

I'm trying to open his eyes to what he is really wanting to do.

Again, it's not a small block Chevy. Not only is the oil timing off, the valve train geometry is junk, on both sides of the rocker arm.
And if he doesn't address those issues, he will burn through his money so fast he'll be bankrupt so fast he won't know how it happened. Unless he is incredibly wealthy, and even then it's still a HUGE expense and a vertical learning curve.

If he's will to spend the money on a Ritter block which has the oil timing corrected, and get the lifter bank angle down to 48 degrees, and use a head that has valve gear capable of that RPM (and it ain't using stands with saddles in them) then I say go for it.

If he's not willing to do that, then he needs to reconsider his options. Like build 400 inches and turn it 7000 and make sure he does it with 340 mains and go smoke some ricers and Chevy junk.