A 283 with a big cam should love the tall gears. When you start winding them up, litttle things will kill ya. I would think that motor should do a hundred well before redline. Tune up stuff as mentioned, fuel filters, float level in the carb, and that 2 into 1 exhaust may be hurting you more than you think with that cam.
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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS
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