How much Paint

I bought my paint only from these guys 1970 Dodge Charger, Plum Crazy, Paint Code # C7 and used this clear Southern Polyuerthanes, Inc.
Used a gallon of paint on my 1968 Dart. No hood, roof or engine bay but I did do inside the trunk, jambs and interior of doors and rear window area. Pretty much used the entire gallon so I would plan on two. Price mine at a few local paint supplies and they were at least double..

After doing some more research, I am definitely going with the SPI universal clear and their epoxy. Their tech sheets are very detailed, which is great for a beginner like myself. I think I am going to start with a gallon for the bay, under the hood, jams, under the trunk, trunk gutter, and maybe in the trunk. That way all that will be done and I can get more when I am ready for the actual body.

Still not sure on what brand base I want to use.