Welcome: I’ve got a 348 going in the 51 Chevy in my avatar. you say the previous owner installed the 348 in the 62 do you know if it was originally a W engine car?
Previous owner put 409 badges on the front fender and dressed the 348 to clone a 409. I like to stay away from the normal engines. My 62 Nova has a 392 Hemi in it.