I have a LQ9 in my 95' Here's some of the things that help me get to where I'm at. My truck is 4wd and made 403rwhp right after it was built. The truck has 1800 miles now and feels a little stronger. If I had to guess it's probably a 460-480 crank HP engine. I got 16.6 mpg on my second tank of fuel driving pretty reasonably.
Stock bore/stroke (fly cut pistons)
ARP rod,cam and head bolts
MS3 Cam
Mild ported and milled 317's
valve job
TBSS Intake
Billet 90mm TB
8.1 marine injectors
Walbro in tank pump
Cold air intake
Shorty headers
Full 3'' exhaust with big body dual 3'' in/out magnaflow
95' RC z71 DD ''wrecked''