Grinding is really not a big deal...Just test fit the engine/trans/starter before installation. The only thing is touching up the paint on the block. I believe there has been a few different variations of these blocks so you may not have any problem. The only REAL STRONG recommendation I would make is have the engine broken in and tuned on a dyno BEFORE you install it. Who cares how much power you make? What makes it worth the money is proper cam/lifter break in...proper ring break in. There is no fear of washing out the engine and ruining the piston rings...No fear of going lean and resulting engine damage the first time you stand on it. These angines are NOT cheap...percentage wise the Dyno cost is not significant...compare that to your health insurance cost each month.
Curt

Oh yeah...I am not talking "run in on an engine stand" like some builders do..Don't let the engine builder talk you out of it (John Arruzza).