I would recommend getting the highest quality available, i.e. carpet set, seat upholstery, engine and exhaust components, you will appreciate it later.
Make a good decision on paint and upholstery color combinations, understand that the paint that looks terriffic today, might just be a nightmare tomorrow i.e. touch-up.
Greg makes one mighty fine product, however, you need to understand that time also is a factor that you may or may not be frustrated with. Make a contract with Greg and keep him updated with the contracted amount of money due him. Don't change your mind and want your money back.
Enjoy your Vintage, I know I certainly do.
John