Dave Chapman said "We have one specifically for the 3/4 and one ton. Under floor that allows stock clutch pedal. Are you using the stock pedal and linkage for the T5 clutch setup, or Hydro or cable?"
Dave, I'm in the exact situation as Carl; haveing a 51 3600 that I'm currently installing a T5 in using stock type clutch and pedal.
In a quick check of your site I didn't see the booster you mentioned. I've very interested in a booster/master cyl setup if you can help. May be best to email, I'm not familiar with forum rules for this area discussion.