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Realistically; you have to match your rear gear to the camshaft and the heads. If you have a pretty reasonable budget, Id do the following

Ditch the TH350; run a built TH200-4r and some 4.10s in the axle.

Learn to tune your quadrajet

Add a 100 shot of Nitrous; start your learning curve with a 50-shot and work your way up. Make sure you use race gas at the track when you're on the bottle

Eventually get rid of the iron heads for performance aluminum heads.

Ditch the rear seat and anything else that adds weight.
 

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TH200-4R. Its a 4speed Automatic tranny that was most notably used in the Buick Grand National. It has a deep 1st gear and a nice ratio spread. Its cousin is the TH700-r4; which is a similar but more widely available transmission. This will give you the 60' you need; and the overdrive for street manners
 
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