i finally got an answer so you did help gonzo

 

shipping to 28305?, thanks

 

If it sticks out from the cover that far it's a long crank and will move the flywheel closer to the tranny. It also is probably not a 2001 model either.
Finding a "stock" LS1 crank is very easy tho. 5.3, 5.7, and later model 6.0L motors use the exact same crank. Bought an extra on eBay for less than $100 shipped across country. I would not shave or modfy the TC to force it to fit.

 

are you sure that all 5.3 5.7 and newer6.0 cranks are the same?

 

Completely. Did lots of research when building the motor, even bought some LS1 pistons and a crank ( donor motor spun rod and main bearings, then changed to stroker idea later ). Part number is identical.
I still have a good ( non long ) LS1 crank, you can have it if you are willing to pay shipping from 87114, ABQ NM. Should be around $30 bucks or so. I also have a set of STD rod/main GM bearings, paid $90 for them. Could add them to the box with the crank if interested.