there was a guy by the name of Leo that had a white one running around with an LS1 about 4 years ago. He has a small cam and custom headers. That thing moved out. He said the LS1 was lighter than the stock motor. Sounds like a good swap.
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if it's cheap & reliable, it ain't fast, if it's fast & cheap, it ain't reliable, if it's fast & reliable, it ain't cheap