I would say a good bet for reliability would be to pick up a Summit catalog. I have seen decent prices in there on suspension pieces, another would be to check ebay. I did not have to do the springs in my '72 but I put KYB shocks in mine and they work great, and they are real cheap. carpet you can just buy several yards of the stuff and with little tucking you can make it work. If you want replace the factory gauge cluster be prepared for a headache and emptys pockets, gauges are not cheap typically