Slot Mag Question

You never said what look you want. With that wide of a wheel, it will generally be a reverse or very negative offset.
This will not clear a stock with rear axle at factory height without rubbing.
So either you will need a higher arch rear spring setup and longer shocks or a narrower axle to keep them in the fenderwell and the rear end down.
If you insist on this setup there should be local custom wheel sellers and wheel repair shops in your area that do wheel polishing.
I sold E-T Mags in the mid seventies. They were a good, high quality wheel.