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Go the LSx route! I have about $9-10k into my setup, that includes the 9", stall, fuel system, and the 4l80E trans, which i couldnt live without. Getting to use this trans with a good computer like the new GM pcm is just a wonderful thing, and its holding the 650hp i make just fine. Last year running no intercooler and 89 octane, 11psi and 12 degrees timing i was running mid 11s@125+. This year with the stall and a few more changes, i bet i can easily do a 10.5 or even a low 10 this year, and that is still on pumpgas and no intercooler, should be able to run 18-20 degreees timing. The only addition to the stock motor is the cam, and intake/injectors.
You dont need to buy alot of stuff for these new motors, just the intake, injectors, a cam, and you can make 650-700hp all day long. Also add forged pistons and rods for a bit over $1000, and 1000hp is just a few psi boost away.
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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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