Check these sites... The first one seems to be a BIG dealership that specializes in crate motors.

In fact from week to week the specials change constantly.

http://www.sallee-chevrolet.com/Chev...block50th.html

http://www.crate-engines.com/inside.html

http://www.chevyhiperformance.com/te...98/index8.html

http://www.gmgoodwrench.com/perfpart...on=ce&cat=9274