Ken...I experienced the same problem,only I hadn't planned ahead!
I fitted my booster/mc before I fabbed my crossmember . As you can see I had to put a 'little' offset on the left side. smile
I realise my trans is a TH350C but the problem seems to be similar.
I guess you may have to consider doing the same.
I have also had some other problems with my disc brake kit,similar to the ones you described earlier.
I don't think this is common to just the CPP kit.
Mine was from Speedway....

Last edited by jockbolter50; 04/23/2009 9:56 PM.
1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.