New Guy in Idaho

Welcome aboard. Might I suggest that if you're going to upgrade to the 5 x 4.5" bolt pattern, you might consider an 8.25" rear end rather than the 8.75". That way you get the 5 x 4.5" large bolt pattern, but if you go an 8.75" A body rear end you'll still have the small 5 x 4", unless you use a rear end from a B body or bigger. The 8.25" will handle anything that little 273 can throw at it. :)