I haven't gotten mine running yet, but have installed a 1995 Z28 LT-1/4L60E in my 1972 Chevy Chassis. it mounts with the stock 67-72 Chevy motor mounts and stock auto trans crossmember. You can use either the 6 cyl or V8 mounts, you will have to run electric fans so clearance is not an issue.
If you need wiring/computer work, this guy does a great job:
http://www.speartech.com/
Also, you can find anything for the engine from Street and Performance:
http://www.hotrodlane.cc, they are a little pricey but have great stuff. They also have a tell shaft to run your stock speedo, I went with a custom dash with electronic instruments.
You will need to get custom accessory brackets or run the Corvette setup.
Any other questions feel free to e-mail me,
NPilot1975@aol.com.
My truck should be up and running very soon.