There were two types of front engine cross members used in 1962, depending when the car was built. The early cross member used mounts that bolted flat to the K-frame, while the later cars used "V" mounts, as seen on '63 to '65 B-bodies. You have to determine what style your K-member is. If you have the later "V" mount, you might try Jim Kramer in Pennsylvania for the steel engine brackets for your big block. I think the rubber insulators may still be available through parts jobbers. These work for either big or small block. A friend is putting a 440 in his '64 Savoy and was able to get his insulators from the local Car Quest.
I would go with an Edelbrock carb around 600 cfm. Those old heads would have small valves and ports compared to later heads. A good newer head is the "452" with hardened exhaust seats. They have big valves and good porting. Since this is an open chambered head, it will drop compression from 10:1 down to 9:1, which could be a good thing with today's fuels. These are the heads I use on my 440's.