I'm doing about the same thing with my 88 F-150. I'm thinking about a Burgany color for the exterior & door jambs. & having the inside of the bed & over the rails painted black.

Should I have to buy 2 gallons of the burgany or would 1 gallon cover it?
I'm also going to clear the whole thing, should I get 2 gals. of that?
If I buy to much clear it won't be a problem. I have 2 other vehicles that need paint after my truck is done.

It isn't going to be broken down to do a peice here or there. When I paint it, it will be painted all at once & finished before the truck sees the road again.