I used an aftermarket chrome bracket that is meant for V8 headers on my 216. The front hole lined up the pulley with the damper and water pump and all that was needed was to elongate the rear bracket hole to get the bolt into the side of the block. $12 and 20 minutes time. The 216 had the wide belt so a pulley made to use this alt on a Ford flathead with the 5/8" belt was also bought. An amazing $19 for a plain steel pulley.
I don't know for sure if your belt pulleys are the same distance off the block as the 216 but if they are then all you need to do is elongate the rear hole in the new bracket. Your belt width will work with the alternator pulley as is. On the 216 even the original upper adjusting bracket and belt worked. Worst case you need a longer belt for yours.
Any parts store that sells the chrome "hi performance" items should have the bracket. It looks like a sideways letter F.
