Fwiw, any other big block mopar ( and in the case of the fords, if it fit a
390 find a 429 or 460 as I belive the blocks are basically the same for
external things like this ) such as a later 400 or 440 car of any body style
with air conditioning . They all had some version of the idler pulley for
the water pump. The worst case here is having to get a different belt in
case the geometry makes the belt length longer or shorter than the
adjustment will allow.
Mikey
62 Crown Coupe