65 the good bad and ugly

Drives poor
First, check that everything on the front suspension is tight. Typically, you need lower ball joints, outer tie rod ends, new pitman arm and idler arm and good shocks, Bilstein. Adjust the play out of the steering box and add fluid. I like Firm Feel for suspension parts, A Body Parts . Formula S cars had a front sway bar. I hate headers, especially fenderwells, if you are going to drive and enjoy it on the street.

As for the Carb
Get the MOPAR specific arm to get the geometry correct. The Holley Street Dominator intake moves the Carb toward the back of the car so adjust throttle at WOT and transmission kick down again.

Reverse
Check the cable adjustment on the transmission gear selector. What rear do you have?

Heater core
Is there, along with the AC connections. Hook up Heater Hoses, AC compressor and engine compartment components appear missing.
Should be a sweet driving car when sorted out. Good Luck!