converting to a carbed setup is kind of a pain. unless you really want to go carbed, you should consider holding off on this project.
in either case, the main things necessary to get a 351 into our cars include changing the oil pan and headers. then it depends on your direction ...
if you want to stay carbed, then you need to change the fuel delivery system to provide the fuel at a much lower pressure.
if you want to stay efi, then you need to get an efi intake and you will need to modify the fuel rails to make them wider and get a different distributor.
the transmission should bolt right up though.
then there is the hood clearance question. a 351 is taller and wider than a 302.