New to me '68 C20

[SpamCo]

Hey everyone, new to the forum and I just picked up a 1968 C20. It runs and drives but I'd like to get it in good running order to cruise around this summer, until I have the time and money to make it look really nice. Its almost to that point but one of the bigger issues is a hole in floor of the cab in the back right corner. Without buying a whole new floor pan, what is the easiest way to fix/patch this so it isn't so noisy in the cab? Also, I would like to switch from the standard 2 barrel carb that's on it to a 4 barrel, what would you guys recommend for a carb/intake setup? Thanks everyone.