Oh, and the ZF is a nice swap depending on what you're looking for. It's a truck tranny and it shifts like one. If you're thinking hot rod, think something else because it won't bang through the gears like a TKO-500.
It has a lugging rattle at low RPM, and if you use a cheap clutch set (ask me how I know...) it's noisy at idle in neutral.
With the granny 1st and OD 5th it's basically a three speed around town. That .76 OD gear is very nice on the highway.
The ZF is a crusher though. The only thing that usually goes south is the shift forks. Get it bench rebuilt if you buy a used one. Again, ask me how I know.