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I would go with basically exactly what i have. I would not go with a 408 either. Get a good 6.0L with a 2wd 4l80 behind it like i did and you will be so far ahead of the game. Then build a forged 370 using the stock crank and a set of compstar rods and wiseco pistons or the brand of your choice. The stock crank has been to +1400whp in both the ohio boys cars, and they say the 370 will make more power than the 408 to boot.
So you saved $1k by using the stock crank, get a set of L92 heads with good springs and a decent cam. GMPP L92 intake and 65# injectors, Intake elbow with the stock TB. Definately go with a turbo, you can get a 302 SBF header kit and have the LS1 flanges welded on and your turbo kit is pretty much done. Put a 91mm Borg Warner unit on there and you should be able to get 850whp on pump gas pretty easily. I make about 575whp with only 9psi and no intercooler, 89 octane. I also use stock everything including the trans.
Oh, and with the 4l80, just a set of good clutches and a shift kit and converter and your done, no new parts are needed.
Gary
Gary
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87 Buick T-type WE-4,
6.0L LQ4 iron block LSx,
65# injectors, dual walbro 255s
HP Tuners 2-bar Speed Density EMS
224/224-112 cam,
4L80E, Fuddle 3200stall,
BW s475 turbo, 60mm wastegate,
9" rear 31 spline with spool, 3.07:1 gears,
11" rear disks,
TRZ Manual Rack and Pinion
full 4" exhaust with dynomax race bullets
650hp 585ft-lbs(crank)on 89 octane and no intercooler, 9.5psi-12 degrees timing
11.42@119-7psi
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