I don't know but I think there's a reason why there are 3 other gears between 1st and 5th. You're supposed to use them. I never liked lugging a motor. I suppose it depends on the motor too. Low compression, small cam motors may tolerate that better.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear
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