What fuel pump did you buy for $300? I used a 93 corvette in tank fuel pump I bought at AutoZone for about $70 and it works perfect and was just a simple swap out part for part. The fuel pressure and volume is excellant with that pump and worked great with my LT1 Corvette engine prior to my new LS1 I current have installed.

The LS1 engine is supposed to be about 350 hp stock, under-rated for insurance purposes. I don't know about torque numbers but can't wait to get on a dyno and see what the numbers are at the rear tire. I am sure I will be disappointed due to drive line loss, though. Most people say you lose 15-20 percent through the drive line.

If the computer hasn't been updated, send it to Allen and have him tune it up for you. You won't be disappointed. You will want him to disable the VATS and rear O2 sensors at least, they aren't in the S&P harness are they?

I am running the factory exhaust manifold from a 5.3L 2001 truck in mine and they fit great and are cast iron tubular manifolds. One day I would like to try a set of late model truck headers to see if they would fit on my 92 C1500.

A Z06 intake is always good for additional performance if you don't want to pay $750 for a F.A.S.T. intake. A good set of ported heads would be around $1800 but worth the bucks. A ported MAF may be good but be prepared in case it makes your engine worse instead of better, some are not calibrated correctly. Mount your cold air intake some place it will get cold air, hot engine compartment air is not as good as air from in front of the radiator or from down behind the front bumper. Popular Hotrodding did a write-up on a few Crane LS1 cams and gave the numbers a couple months back, might check into this. Of course, run only Mobil One oil for a few extra horses. True duals all the way out with an x-pipe is a must for performance, 2.5" pipes would be a good size for this engine, much bigger would be nice but not necessary they say. An adjustable fuel pressure regulator would be good for the days on the dyno. Some engines will gain power by lowering or raising fuel rail pressure by a few pounds.