hello forum ,looks like I answered my question,YES the whole thing comes off .12 bolts total counting the one on the after brace.I took the bumper off first but it could have stayed .No bother as Its getting moved to the other frame anyway.I have the clip sitting on the 55 frame and it looks a little high to my eye .Not gonna worry about that til I get the cab on ,.The frame is shorter as I was told but think I can weld a bit on for the bumper mounting.,Athab3

Have 55 GMC 9300 short box step side .Needs restoring but starts and drives ,no brakes, also have 59 GMC 9380 with very good cab for parts.have been doing MGA's all mjy life so this is new to me