What length tail shaft on TH 350 would be the same overall length as a Jetaway 2 speed? Thanks!

 

Short, should bolt right in, Good Luck.

 

Actually, it WILL bolt right in. This is about the easiest trans swap there is. The only issue is the kickdown cable. The 67 cars don't have the through-the-firewall provision that the later ones do. You'll need to go with an aftermarket cable and bracket.