Re: Gas tanks-plastic or metal?
Plastic tanks have been used for many years in both car and trucks. I have never heard of any problems other than possible punctures when running a trail without a skid plate. I just installed one on my '79, the tank needed a larger diameter than stock main hose (approx 2 1/8" or 2 1/4"), but the older setup is probably different. Be sure to flush it out with fresh gas to remove any plastic shavings before installation. Good luck!
Steve Mcqueen fan.