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I think putting a turbo 350 with stock converter(or small stall if budget allows) would be a better investment over a stall in a glide and gears. Nothing wrong with a 307. Dont be shy on the exhaust,2 1/2 is better.The only thing I didnt like about the 307 is they had a nylon gear on the camshaft.New timing set with the new cam will fix that. Other than that,just treat that engine likes its an under sized 327.
 

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the 3 speed by itself will improve the car the most.A bigger cam in a glide car with near stock gears and it wont make much difference. Did the stock heads fail you already because of unleaded fuel?
 

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first gear turbo 350 2.52x3.07=7.7:1 launch gear

power glide 1st gear- 1.72x3.73=6.4 launch gear

spending money on gears and high stall will just cut your fuel economy. might even slow the car down?
 

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not all diffs are tagged with the ratio.Tou might have to do a gear oil change to find out.3.36 is not a terrible ratio couple with a 3 speed,and even better with a 4 speed auto as they have a 3:1 first gear ratio.
 
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