I don't know why people keep wasting their time on those crates!
No compression, crap heads, little cam, no power!
For a bit more money you can get one of these roller blocks.
Compression, roller cam and vortec heads.
Sure you need a fuel pump and different flywheel or flexplate but you should replace those anyway.
http://www.jegs.com/i/Chevrolet-Perf...30282/10002/-1