The 496 would be a great motor for your truck. That was what I was going to build first but ended up building a 511. The 511 puts out 589 hp at 5200rpm and 671 tq at 4200 rpm. It runs great for a driver.
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Darrell
1972 Cheyenne Super C20 (Heavenly Too) (My Street Truck)
2000 S10 Xtreme (Black Magic) (My Drag Truck)