yes i run the exact combo you are thinking about,the backspacing will be the same as mine as there was no other options in a 5.5\" centerline rim.
as far as having 5.5\" rims on the frt i cannot help you as mine are the 3.5\" .
and the use of a 3.5\" rim may require narrowing the beam ,but if i remember they do clear.
centerlines are light and still one of the coolest racing rims made.
since they are a real 2 piece racing rim that is rivited together they were all expected to use a tube.
but for street/track use it adds weight so the centre sealing can be easily modified to allow tubless use.
my biggest concern was mounting to the car .there are a few ways to do it and mine is possibley the most positive .
this phot shows the studs and collar i made.
if you are seriously going to buy them get in touch with me and i will cover the different mounting methods.