It shifts like poop and the metal line to the tranny is disconnected. There's the problem! There is a metal line between the vacuum modultor valve on the transmission and the vacuum source. In the case of my old '66, this is an intake vacuum source. I have since added power brakes, so the vacuum line was replaced with a vacuum fitting, with fittings for the PB booster and trans
. modulator line. This metal transmission line needs to be hooked up to an intake vacuum source. I am looking at your diagram; is this small vacuum tree on the intake? If so, perhaps that is correct. However, I would lean towards using the tree that the PB booster uses.
Even a slight leak in the modulator line will cause shifting issues.
As for the heater valve, the vacuum for that is sourced from the heater controls inside the car. From the controls, there should be a vacuum source coming from inside the car to the engine, possibly on that small tree?
I think the grey line from the distributor should go to the carb. The yellow line from the carb to the booster lg tree doesn't seem right.
Oh, what a can 'o' worms! To sum it all up:
unhook yellow at lg tree and replace tranny line to lg tree. Hook dist to carb.
This is based on what I know about old cars, if I'm wrong I'm sure someone will let me know