While my '47 has had a V-12 in it for at least 20 years, there are still mounts in it from an earlier V-8 swap, no idea if it was a flathead or a Cadillac
(which was also a popular swap.) I've left them in case I ever need to save up for a V-12 rebuild I'm likely to have access to a flathead V-8 "loaner" from my brother.