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I presume by Kit - you mean a cobra kit. You did not mention anything about wheelbase (wb). The Tremec 6 speed (t-56), you will find, is way too long dimensionally. If your W/B is 90", the T-56 will not work. I tried it. The T-5 with the 0.62 OD as you noted is not very easy to drive as you noted. It has a tendency to "buck" - and you are correct about the 3.42 gearing, a 3.73 or 3.91 would work much better. 3rd time a charm, I put the TKO-6 with the 0.82 OD with the stock 3.42 dana R/E. Runs beautifully with 500+HP 351/408W. The 0.82 can handle more torque.
If you're gonna do a lot of highway cruising, 65-80mph, then go with the 0.62. With 3.42 RE, 70mph, 1700 RPM - a lot quieter
If you intend to race it or a club "drive fast laps" around a track for fun, I would definitely go with the 0.82. Stay away from the 0.62, you will lose too much momentum on the straights, and you will be past in the straights - the dynamics of acceleration.
My 0.82 works better - at 70mph, in 5th, 2300 RPM. I can still accelerate quickly to over 100+.
Back to the W/B, there are several kits with WB variation from 90.5 to 94", that might accept the T-56 and give you the best of both worlds. This seems logical from a mathematical perspective (longer wb for a longer tranny), but the real world - I couldn't tell you.
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