You guys using old V-belts or serpentines are....let's say, brave.
If they'll break driving a fan & alternator...no thanks.
I use seat belt webbing if a chain won't work.
I'd prefer accessory/bell housing threads to head bolt threads, but I've used the carb-mount plates on my SB motors (which isn't what the OP was asking).
Pretty much depends on the task at hand.