I personally haven't done a top on a 64 Polara but I would recommend hard rubber tack strip over the cardboard stuff. It's available in different widths and thicknesses through Key and Electron. They sell it by the roll

This era mopar generally was attached by gluing directly to the outside of the body ,then a thin metal lock down trim was screwed over it. The belt molding trim was installed with button studs covering the lock down trim. I'm currently installing a 58 Plymouth with a similar attachment.

Thanks for the response. Would you worry about adding side tension cables if it didn't come with this year?

I wouldn't be too concerned with side tension cables on this model. I like to make the pads (not universal) to fit close to the top edge of the side rail. Keep the pads thinner so this will allow the top to fit tight to the side rail. After installing the rear curtain , start installing the top by gluing the 1/4 flap to the 1/4 rail. I find this holds the roof in a spot where it needs to be. Then it allows you to pull the top rearward toward the rear bow (always keeping an eye on your center and side seam mark on rear bow) and belt line.

Thanks. Just repaired the rear bow corners with some stripped out window channel. It was hard getting it to bend backwards but I did it slowly and epoxied it in with Norton Speed grip. Then after cleaning up the inside channel epoxied plastic tack strip in. The owner found the old pads and brought them in to me and the felt for the two middle bows. Had to dig out the card board tack strip he had already glued in on all 3 bows but im finally starting to get somewhere on it. He bought new pump cylinders and hoses but not fro the same company and the ends are too small to screw in the cylinders. I told him about it and he came and got them. Came back and found an adapter that fit the line but was the wrong thread for the cylinder. But he forced it in and is going to do the same with the rest. I told him it not the right way to go about it. That it will probably leak. Some im sure that is going to add to the time it takes to roll this old girl out. Also found out that someone removed the whole top frame amd never mark it before removing it. Side are way off from each other. Lol gotta love a challenge in this business.