Not sure about the sort of thing you are talking about. Probably I have nothing as an answer. The new GM 350 will have an Edelbrock Air Gap Performer intake and a 600 CFM carb. The choke is electric. The exhaust will be 2" or greater with Edelbrock exhaust manifolds.
I don't know that carb/manifold combo but EFI is the best way to get precise fuel mixture control at slower engine speeds. Running a carb instead of EFI I think you are giving up some potential fuel savings and possibly performance.
Not knowing how often you'll make the trip nor your budget you may have already chose the best compromise.
