Roger:
Don't use the FP-35. Unless they have been modified, they tend to "run away." You won't like what they do. As said before, the best thing to do is get an OS 35S. You'll love the way it runs, and it is more likely to fit. If not that, then the FP-40. Get one of your local guys to make a tank for you that will fit. Lately, I've been making deeper (thicker) tanks so they are shorter and fit short noses better. Plumb it per Paul Walker's recent remarks on uniflow tank making. We have had all kinds of problems with commercial tanks (rust, dirt, chunks of solder inside, pin-hole leaks, loose tubing) so we are making our own. In fact, late this winter our club will have a tank-making clinic.
Good luck!
Scott