I use a new process manual with overdrive that came out of an 84 chevy pickup. They made these for about 5 years so if you look on ebay you will find one. You do have to shorted your driveshaft and you have to remove the nosepiece from the front of the tranny and get it machined down about a quarter of an inch. The rest is a bolt in. It really lowers your rpm in 4th gear. It is heavydury enough to handle a 350 with no problem.
