I put my new 383 sbc and tko 500 on the road for the first time last weekend.
Rear is 3.08. Even then, the 3.27 first is very very short. not a bother just cruisin from stop signs, but instant redline and tire smoke if I get into it in first. The 5th gear is pure fantastic. The drop from 4th to 5th is NOT a problem at all, and she tach's 2000 rpm @ 70 mph, smooth and quiet as a church. The closer ratios and taller first on the 600 would probably be better, but even then I'd keep the rear axle fairly low, no higher than a 3.55.
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