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3.73 is about as low as i would go. the engine is pretty strong with the svo block. it probably has a vic jr intake, you can replace that with a rpm air gap and that will give it some zip. the cam is probably retarded, advance about 4 degrees and that will help. change heads will help little. i did a write up on doing this if you search. getting rid of the heavy 40 pound flywheel/clutch for a lighter unit will help quite a bit.
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