New, Complete In Box! Gear Vendors overdrive for Turbo350 (can swap adaptor for Turbo400).
$1,350 obo.

From the GV site:
At about 2200 dollars, the GEAR VENDORS is not the cheapest way for you to get overdrive (a rebuilt wrecking yard 700r4 is probably cheaper) but the GEAR VENDORS is by far the best way. Horsepower handling is the first issue. A GEAR VENDORS will handle 1200+ horsepower reliably. This is why you have seen GEAR VENDORS in 8 second 1/4 mile cars in publications like Hot Rod and National Dragster. This is also why all GM Callaway Corvettes with automatics came with a TH400 and GEAR VENDORS instead of the 700r4 which is the base Corvette trans. If you're running more than 1200 horsepower (and we have customers that are) then talk to us at the factory as there are some hydraulic changes we do for vehicles up to 2000hp...
more:
http://gearvendors.com/hrgm3s.html

I had planned the install for my 67 Camaro, but a prioriy shift in my home life has made it impossible for me to continue my Hot Rodding for now.
It's going up on ebay as well, but I wanted to give y'all first shot.