Hey 429,
Great lookin coupe you've got there. I have a few suggestions on the interior. One guy beat me to it about the window cranks, with the billet ones from 50resto.com. Or, if you have a good junkyard nearby, you may get lucky and find a good pair. Since interior parts don't care what motor is under their hoods, you can get them out of a 4-banger if they're clean. I have gotten a lot of parts from salvage yards, and saved a bundle of cash in the process. Check it out...
Oh, for the rear-end ratio, you can look on the differential cover plate and one of the bolts should have a little metal tag attached to it with numbers stamped in it. The numbers closest to the bolt head should say something like "2 L73", or "3 L08". These mean 2.73 and 3.08:1, respectively. This is assuming they haven't been changed, of course, but your factory gear won't be any steeper than 3.08. Hope you find some more goodies like the shifter
Jeff