The harmonic balancer is a special order from Buffalo Enterprises, modified specifically for the 235. It starts as a 250 cid balancer, which he machines down and cuts an extra groove in it to run an additional option. In addition, it needs to be rebalanced after his machining operations. He is included in the Stovebolt links.
I chose to go with his 2 groove balancer and the old air low mount a/c compressor...with my alternator placed on the passenger side, so I could run the alt/water pump/crank off one belt instead of fighting the alignment problems with 2 belts, and adding stress to the waterpump bearings. The a/c compressor runs directly off the front groove of the H/B and my p/s pump will be driven off the 2nd groove in the a/c compressor.
Dave