c3 trans

has any one put a 700r4 trans in a 68-77 vette.If so do you have some specs to go by  

There's been plenty done, and as far as I know they're fairly simple.  BowtieOverdrives.com sells bolt-in crossmembers for the C3 Corvettes for the 700R4's, any competent shop should be able to do the install.  The hardest part should be getting the driveshaft shortened & balanced, and calibrating the Throttle Valve.  BowtieOverdrives also sells the TV made easy kit, and BowlerTransmissions also has a throttle valve kit.  Otherwise it's pretty straightforward bolt-in.  If you want your shifter to go to all 4 positions however, you'll need to order the kit for your shifter to do so, Corvette Central has them for about $100.  Personally, I went with a 4L80 for my swap, and it's been a nightmare.  If I had to do it again, I'd have done the 700R4 instead.

But yeah, in short, all you should need is a Throttle Valve kit, the custom crossmember, and the shifter detent kit.  Possibly a longer shifter cable.  At that point all you'll need to do is pick your 700R4, stall converter, and a shop to do the install, or if you want to do it yourself, a shop to shorten & balance the driveshaft.