Your pretty lucky being in the States, lots of go fast bits readily available at reasonable prices and far less restrictions on old cars than us. Be aware that Holden used a lot bit from the Pontiac parts bin.... Pontiac Rally 2 rims will bolt straight on with Pontiac wheel nuts... You should have no problem getting 15" rims to suit that are correct looking and then just grab a set of wheel cap decals from Rares. There are plenty of other bits from 60's and 70's Pontiacs that will fit, also from some Chev. I got a Nova indicator switch for mums HG Monaro, rebuilt 4 barrel Rochester carb for my ute years ago, Nos Firebird steering wheel also for the ute which I now wish I'd kept.

Stickthis on this site does the decals so getting it back to fairly original should be pretty easy. White with slate black trim, 308 4sp is a fairly desirable combination here in Aust. and it would be a shame not to keep it fairly original if you have all the original drivetrain. There is no shortage of hotted up modified cars in the US so a genuine restored Aussie Sandman would really stand out. However it is your van and you can do whatever you like to it, plenty of members on here will be happy to help you out and I look forward to watching the build on this one.... Please start up a build thread on here and keep us posted of your progress.