Well it has been months and I am near complete on my carpet; I left it under weights all winter long. The front carpet install has been an experience... meaning I made a few beginner mistakes:
1. My ACC carpet came with the underlay glued to the carpet underneath, and the shift hole was cut out of the underlay. So I cut my X into the carpet there, and set the carpet in place keying off the shifter. I did not realize at the time that this placed the carpet 2-3 inches rearward of where it should have been. It did not seem like a big deal, but now the carpet does not reach up to the heater like it should. The front edge is a few inches to low. Not so big a deal on the driver side because of the column and pedals, but noticable on the passenger side. This can't really be corrected without replacing the front carpet or installing black insulation of some kind.
2. I accidentally cut past the line I drew around the shifter, a nice 1 inch diagnol starting at the left rear corner of the trim ring. I fixed this with needle and thread, and carpet tape. However, I need to do some work with a little left over carpet fiber to disguise a bit of edge that is visible.
3. I somehow cut the carpet about an inch too far in, just to the left of the high beam foot switch. I used the grommet that came with the carpet, and when I installed the kick panel, it pulled the carpet so taught that it distorted badly at the grommet. So I have spent a couple of hours sewing a piece of carpet back on at that location to provide some slack and make the carpet sit better there. I coated the seam I sewed underneath with JB weld and will add carpet tape as well just to make them stronger. The seam runs either just behind the kick panel or in front of it as it not perfectly straight. I used the fuzzy '74 carpet, so the seam does not appear to be too obvious.
I still have several wrinkles to deal with, especially behind the shifter and below it on the driver side where the transmission hump and floor form a pocket. I bought a steamer but I have not yet been able to steam out the wrinkles. A bit aggravating; not sure if I dare put an iron on them.
I used some Permatex headliner adhesive in a few places. Despite coating both surfaces and waiting the recommended time, it only formed a weak bond. I guess that may be a good thing if I or someone else wants to redo the carpet in the future.
I made all the seat mounting holes and seat belt bolt holes with a soldering iron per advice on this site.
Whew, what a process!
One question if anyone can answer: I cannot locate the holes for the sill plate end screws on either side of the car. The holes in the rocker panels are fine. Are the end screws supposed to run through the pinch weld? If anyone has a photo, I would appreciate it. When my restorer did the floors on my car, or worked on the rockers, these holes apparently were filled. Strange.
Thank you!