On the 235, 261, and 216's I've converted, I've just used the factory generator brackets. Just flip the water pump to gen bracket upside down and it works fine. I just cut and welded the block bracket to fit the alternator and elongated the slots to line the alternator pulley up. If you have one of the old style wider belts you can just take the pulley off the generator and put it on the alternator, the shaft sizes are the same!
