hey nice to see some guys doin some 71-73 's ive gottin a ton of parts off of ebay you just have to be careful and ask the sellers plenty of ?'s. as far as 351c power issues i dont have any issues and i dont have alot of $'s in the old plant thats in my car now and with the 373 gears, i give some school kids a run for their money in those newer cars...lol , and i can drive it anywhere i like, but i think ill get away from the carb soon and go with a holley fuel injection system, years back i put electronic ignition in and with gas like it is now the ole "c" motor needs a lil mpg's. hey as far as the interior goes if yours is completly thashed now would be a good time to go with a completly different color, unless you are just in love with the Avacado..lol (i had a 69 with the same color interior, hated it) like dark knight mentioned you can dye stuff and it works really good to.. dive into it man, its your car do what ever you want, i decided years ago i do what ever i wanna do to my cars as long as im happy with it..
if you have problems give us a hollar