Well to tell you the truth I don't know either...
You might just try Jasper like the others have mentioned.

I can tell you this..
One of my best friends has worked for Chev dealerships for about 13 years now.He as a Master ASE mechanic.He has seen his fill of GM crate motors.Many,many returns and claims.He can get new ones at quite a discount for personal use.He will not use them...

Try posting that question at a couple of the other car boards such as
http://www.nastyz28.com/cgi-bin/for...ne=5&LastLogin=
http://www.chevytalk.org/threads/po...at=&Board=UBB64
http://www.camaros.net/cgi-bin/foru...f=4;DaysPrune=5
http://www.chevelles.com/forum/ulti...p?ubb=forum;f=4

These are all great boards.Team Chevelle is quite good.They don't care what car you have as long as it's a Chev.These guy's are very into performance