My engine is 1.2" wider than stock, high deck block, and I am using the CSP bellcrank. But, as suggested above I had to modify it a bit. I cut both rods, then thru drilled a pair of 1/4" mild steel rods, each about 1.5" long, the hole being the diameter of the cut rods. Inserted the cut ends of the rods into the 1/4 drilled rod, slid them out by .6" on each, then brazed them in that position. Painted the modification with spray silver. Re-installed on the engine, adjusted and synced the carbs, haven't touched them since. IME the center pull carb set up from CSP is far superior to the hex bar stuff, even with Gorden (and others) very sound retrofits with bearings and the like.
The total time to modify the CSP linkage for my large engine was under 1/2 hour. Unless you have a high deck engine case, this should be unnecessary...