From Rivieras to Cookies

[Eurolook71]

I just got a set of 15X7 cookie cutters. I currently have 15X5.5 (<--I think) rivieras. I'm not sure what the offset is on the rivieras, but I have no clearance issues on my 71 Super. I'm at stock hight and still running drums up front. I've read that 15X7 cookies have an ET of 23mm. If I go with Ghia discs up front, and lower Via MAXX strut housings, will I have any clearance issues with the cookie cutters? I've also read that a 15X6 cookie cutter is much better suited front the front, since the ET is around 34mm. That sounds more like what I need, from what I've read. Any help is appreciated!!!