How much paint for our trucks?

[firefighter736]

I thought about posting this is the Paint section but I thought maybe it'd be better suited here. How many gallon(s) of paint do I need to paint my '66?
I'll be purchasing the Hot Rod Flatz Gallon Kit (with Reducer and Hardner) and was wondering if that would be enough to do the body and jambs (not the inside of the bed, though).

Thanks!

Edit: I searched the site and couldn't get a consensus...