[Jack21]

If I had 400+ CI for a mostly street, and sometimes race car and was inclined to light the tires regularly, I'd go with the Richmond Gear 5 speed box with the 1:1 5th, and 3.08 rear gears for cruising. The RG gears are more evenly spaced so all are useable.

Tremec does not have close ratio gearset. .83 OD is a bit more practical, but "Tractor" 1st gear is too low.

Like Bob, I tend to drive somewhat gently, and am not likely to tear up the trans smoking the tires. Am using what seems to be underrated T5Z. It was blueprinted by Liberty transmissions, and fitted with the .80 OD. Liberty advised I would be happier with the T5Z on the street (over the Tremec), and they were right. Thing shifts like a Honda, and the 2.95 1st is just right. And anything over about 40MPH I'm in 5th. The car is street only, and with street tires, the tires will smoke before the trans sustains any damage.