out of curiosity, what year is that LT1 ?
my one buddy and i put a 95 LT1 in a 55 chevy here about 6-8 yrs ago, and i learned a ton of stuff i didn't want to know ! i got real friendly with the outfit that sold the conversion harness, but with their help, and a cadillac FSM i got from the local GM dealer, it turned out to be a nice setup.
had lots of power in that car [he isn't a drag racer, just a cruiser], and with a 700R4 transmission coupled with a 3.73 rear from a firebird and 255-70 tires [almost 28"diameter] pulled down 26 mpg easily.