When I did my '53 I used POR-15. Since you had it sand blasted you'll need to treat it first with POR's Metal Prep (just pour it in a spray bottle and spritz it on). Then you can either spray, brush, or roll POR-15 on. Its a very hard finish that won't allow the surface to rust again.
Now... if you're going for a "show" finish you'll probably want to prime and shoot BC/CC on it, but it won't be anywhere as durable as POR-15.
"Instructions are just the manufacturers opinion of how it should be put together". - Tim Allen