Track frame attachment on 440IC

[Hilltop]

Hi, Does anyone know how much clearance there is around the crossbars where they mate to the track frame. As near as I can tell there is about 0.150" clearance around the front cross bar...Should I get the bar built up or make a bushing to fit? On the rear where the cross bar goes into the track frame how much clearance should there be? I am thinking they should be tight but I don't want to run into any adjustment problems. Thinking about getting linebored to line everything up. This is the later model serial #448915 with the clamps on the back cross bar to hold it together