I just purchased 360 modular wheels to put on my 94 348 Spider. I know this has been done by others and I'm hoping to get the right formula for fitting the back wheels so the car doesn't look like a jacked up 69 Charger, not that there is anything wrong with those. How much needs to be machined off the hub? What wheel bolt length? What tire size? The tires on the rear rims currently is 275/40/18 I have spent a ton of time using "search" and really never found a true formula. Lots of inspiring pics and a few WTF's that make me really want to get this right. Thanks!