Wade I am sorry to hear of this.

Years ago I was in a hurry to put the engine in the car. Everything was checked.
I put the flexplate on the crank & torqued it.
Put engine in car, did testing. It kept slowing, then it died on the turn off. It wouldn't crank with starter.
Got towed back to pits. Looked things over, then it started. So after it cooled it would crank.

Long story short the ARP flexplate to crank bolts were TOO LONG! The bolts jacked all the end play clearance out of the crank.
You would think you would hear or feel the bolts rubbing on the block.
ARP said oops I guess chevy bolts won't work for that engine.
The 1 thing I didn't look at caused that engine to be rebuilt.

It wasn't the engine builders fault it was the intaller's (me)
ARP made the correct bolts after that.
Don