Hi! Welcome to the forums!
Your Ford should do just fine on regular unleaded. Trucks were required to use unleaded around 1979-1980 so it should be good to go.
Get the make and model numbers of your stove and oven, the stove top probably doesn't have a pilot light, the oven might or might not.
Several possibilities on the fridge issue, make sure that the flue and burner area are clean, spiders and other critters LOVE the propane odor and will built nests that block the air flow in the burner area. The thermal couple might be mis-adjusted or bad.
If you get your model and serial numbers of the various appliances, most manufacturers websites have the manuals available. If you can't find a specific one come here and ask. I have a few older manuals that I can scan or maybe we can help you locate them.
BTW we want to see pictures!
Aaron