RE: Throttle servo challenge
Two comments:
1. You can redrill the mount for a bolt hole in a more convenient place, and you can cut away the part of the mount that interferes with the carburetor bolt.
2. You can drill your throttle link hole wherever it works, outboard of the mount. Then you can bend the wire around like a paper clip, with the clevis in front (or at an angle, or whatever's necessary. The bends won't hurt anything.
This assumes you can balance the plane with the engine at that location and the cowl fits where you want it.
Good luck,
Dave Olson