Camshaft to Small???

I re-read the OP. It says street car. "Very driveable" and "spunky"

I actually think that while that cam is very mild, it will meet your expectations. Probably exceed them by a good margin with the tremendous bottom end torque it will generate.

That cam is small for 400 inches and a 4.10 gear. You need more cam and converter.

I love these forums........sometimes. This is one of those times. Though both of the gentlemen appear to be at odds over the cam choice, really neither one of them is wrong. Due to their expertise at tuning/setting up an engine, they could make both cams work. Either way or something else, this ought to be fun.