The Garret turbo on your 3.0 liter diesel is not well matched for use on a 4.3 liter gasser. Heat at the turbo is not a big issue here.

Through the years I have turbo charged many engines. Rod and piston damage were common occurances on stock engines that were not "beefed up". Forged pistons and Carrillo rods stopped a lot of failures. Oil squirters on the piston bottoms and opened up oil galleries in the crankshaft also helps big time.

I like to use Turbonetics turbo chargers. KKK are my second favorite. Look for a compressor map that matches your displacement for a starting point.

Blowing a hot mix through a turbo isn't great either.

I'm 100% FOR people experimenting and modifing their toys. Just be sure that you ask all the questions and get good information before you get a nasty surprise.

If you think those old stock rods and pistons are strong enough to take a (roughly) 40% increase in power, go for it.

http://www.turboneticsinc.com/