Carnage. (was "What can I swap in?")

[derekf]

I broke my engine today. It's never even left the garage.

Trying to figure out why it's idling at 2500 rpm (assuming a bad vacuum leak), over a period of about ten seconds it went from 2500 rpm to running real rough and shaking the car to a bang sound and all the oil falling out of the bottom.

I'm expecting that something physically broke (hence the bang) and that I'll need to swap motors but closed up shop and went in after putting a pan to catch the oil.

The car has the complete wiring harness - and computer - from a 2000 TA. What can I replace this LS1 with? I know the easy ones - the iron truck 5.3s and 6.0s, and of course other LS1/LS6s... but what about the others/newer LSs, will any work with the TA's computer? I've got EFILive so can adjust settings if needed.

Where's a good bang-for-the-buck?