20s on first gen camaro

[stoney]

hey guys, sorry if its been asked, i had a good look but didnt find much.
what kind of work would i need to put 20x8.5s on the front of a 69 camaro?
ive just bought the car and it hasnt arrived in australia yet but want to get wheels on it asap.
was looking at 20x10s on the rear as its minitubbed with a 28x10.5 slick on it at the moment.
the wheels would be commodore offset (equiv to the newer model Pontiac GTOs) so they will sit in a bit further than camaro offset wheels.