I ordered the seatcovers from YearOne. It took a few months for the order to arrive. I also got new foam and install kit from Legendary Auto Interiors. The carpet was from OC Auto Carpet. One surprise about the carpet is you know how in pictures when people are selling carpet, it sort of looks like it's been pre-molded to contour to your floorpan? Well the OC ones were NOT that, so making it look good and fit was difficult. Maybe there is a better supplier out there in terms of fit/molded. The 7-pc sound deadener kit was also from OC Auto Carpet.
I watched several seatcover install videos for various GM 1965 cars (over and over). It was quite tedious and I took my time.
I had driven the car with no interior in in other than the drivers seat....and now with full interior it is obviously MUCH quieter. Until I stomp the gas that is....