Have you thought of running a turbo setup instead? Less heat soak, no belt slippage issues, electronic boost controller to modulate the power easier, EBC can also have multiple power settings vs having to change pullies, more hood clearance.....
Have fun putting down 700rwtq+ off idle to the pavement. Plus the ability for servicing of a turbo locally etc.
A killer turbo is around $1500 (or much much less), use factory cast GM exhaust manifolds for the hot side with a fabricated crossover to the turbo inlet (no need to buy headers), A/W or A/A intercooler options $200+ new, $350 wastegate new. Plenty of shops in TX can build you a custom setup if your shop can't.
I'm planning to make 700-800rwhp on a stock $650 shortblock with my setup. 1 setting for 91 octane/meth injection and another for e85.
Traction modulation from either boost by gear or Davis Technologies traction control via the Holley HP EFI.
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Project: 1969 Chevelle, alum 5.3, GTS76 turbo, Chiseled Perf A/W intercooler, Holley Dominator EFI, Davis TC, JRi coilovers, 14" brakes, T56 Magnum. CTS-V Recaro seats!
Coffey Fabrication Nashville, TN doing the fabwork! 800rwhp+/25mpg+/9's@150mph goal 
https://lateral-g.net/forums/showthread.php4?t=52976
1993 Mazda FD RX-7, built LS7, T56 Magnum, Holley HP, Davis Tech TC, 8.8" 3.73 Cobra IRS diff, DSS axles, Ohlins coilovers, big brakes.
CCW 18x11 front 315/30/18's and 18x12.5 rear on 335/30/18 RA1's, 2850lbs
10.31@137mph 165mph Shift-Sector 1/2 mile speed
441ci AllPro headed motor and 200lb weigh reduction in the works....
Last edited by gnx7; 01-22-2013 at 03:43 PM.
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