The frames hold up pretty well, best recomendation I can make on suspension is to go with front disc brake, stock power steering (the power assist gives a wonderful road feel), and 1" front and rear sway bars (ADCCO used to make them). Boxed rear control arms also help.

Chances are depending on the shifter you will not have to notch the front seat to clear, but a console and bucket seats will definatly eliminate any problems.

Also noted in the picture that the heater is missing, yo could delete and go with something like Vintage air but if you want a stock heater I think I have enough pieces for either a comple Delux or standard (recirculating) set up out in the shed.