Alright, I finally have a 02 LS1 engine for my 2002 silverado, along with most of the parts I need to swap it with my 4.3.

I'm wondering about my transmission though. Its the original, 5-speed manual, and I'm not sure if it'll handle the LS1. Would it be better to go with the 6-speed or drop in an automatic transmission (which would be expensive as hell I'd imagine)?