20x13's on a 69 camaro???

[adriana]

i am building a 69 camaro and i want to know if anyone can tell me for sure if i can use a 20x13 on the rear because most of the time i see 12's. the car has air ride and wilwood disc brakes and of course it has been mini tubbed with detroit speed tubs. i also want to know the widest wheel i can run on the front without clearance issues if i run a 19. there are no mods on the front other than tubular control arms on the stock frame so i assume it is basicly as it was stock. i'm not sure what other info would be helpful so let me know. thanks for the help