chuckthetruck
I don't want to ruin your day or even your whole month, but are you sure that is an over drive trans. I have never looked at "Chevy" A833, but on the Mopar OD The 3-4 (front) shift arm has to be put on upside down. I.E. the shift arm is under the shaft and the 1-2 arm is still above the shaft. On this trans, overdrive is accomplished by switching the functions of 3rd and 4th. Direct drive function through the trans becomes 3rd. What used to be 3rd becomes 4th because that gear on the cluster is made larger than the gear above it on the main shaft.
For your sake, I hope that I'm wrong and chevy has made a different shift fork arrangment inside.
If you use this trans and shifter there a couple of changes you may want to make before you put it in. The drop in shifter is a little loose. If you weld it up it's harder to put in the vehicle but shifts are solid. Most of these already have a small hole front and rear of the shifter housing. These holes are in the right place for shifter stops, but you have to drill them larger, thread them and put in bolts and locking nuts.
I just took another look at your pictures. The small hole is visible on the front and is for the 2nd gear stop.
I like Corvairs also. I have a'65 Corsa conv. I've had it since '73 and I'm in the process of redoing it again. Rust on the bottom of the quarters and under the windshield. Yours looks nice. '67-68?
