Glad you're making progress. I can only comment of the overdrive. I have a 3.90 rear gear and 27" rear tires. My 2nd overdrive is 0.5 and first over drive is 0.8? or there about. I only use 6th on the interstate. Even then, 5th gear would work just fine. I typically don't go over 4th in the city though the car drives and accelerates in 5th just fine at lower speeds. Personal preference there I guess. Point being, I wouldn't worry about having a six speed. So long as your engine is tuned well, it will run fine in the lower rpms the overdrives will keep you in.
Now, if budget is tight and or putting a 6 speed in a first gen is significantly harder than using the 5 speed, I'd go with the 5 honestly. I had the T56 so there was no question I'd use it. I don't need it at all. Though, it is fun to hear the exhaust noise completely drop away at interstate speeds because I'm scooting along below 2000 rpms.
Good luck.
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Trey
Current rides: 2000 BMW 540i/6 and 86 C10.
Former ride: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
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