There is a color code assigned to the interior panels and if you can get a old paint chip book that includes the sixties and seventies cars it will have a formula for that color along with notes on what level of gloss each panel gets (mostly medium to low gloss). SEMS makes a good ready to spray option for interiors as it's ready to spray out of the can and most paint jobbers can put it in a aerosol can for you if you do not have spray equipment. I am not sure on the 71 model if the interior trim panels are plastic or metal, however if they are plastic or fiberglass I have never found a way to strip the old paint off the panel without ruining the grain. If the panels have never been sprayed before I would just clean the panels very good with a cleaning product made for preparing plastic for paint and at the very most use a light gray 3m scuffing pad to sand the panel before painting. Normally if the panel has grain to it and cleaned very good, you should have no problems. The SEMS interior/plastic paint is very thin and does not tend to fill in the grain like your typical enamels or lacquers. The most common mistake I see in interior restoration is the panels are too glossy and gives it a cheap look. Gloss level can be premixed or added with a flattening agent and will take some trial and error to get the correct gloss. This has been my experience with it, hope this helps.