deadeye
Expanding on Zagnut's comments, How about:
1) tapping for studs in meaty area 2) pheolic resin plate sized/drilled to fit to allow using the adapter per pic; 3) drill install smoke fitting nipple in head to meet existing pressure/vacuum hole; 4) someone knows where to put a nipple in that carb and gasket seal the existing hole in carb face. 5) system would allow optimizing the linkage alignment if it is a problem.

I visualize the messing around that would be involved if that rubber seal loosened either at the large OD or the pulse nipple. That rubber boot may also affect linkage as it will allow some movement.

The part is for a G62 so size and ID should be close to your carb. What model / size carb comes on that engine?