Actually the car should not have a a front bumble bee stripe at all. The car is too early for that. It should have white pin stripes down the sides. Here is an ad from Dec 1966 that shows the different models.
I would ether leave the powerglide, or swap it for a TH2004R. The TH2004R is an over drive trans (the TH350 is not) and is the same size (no need to shorten the drive shaft), but it will need another cross member to mount it.