I would lean towards the 373 so you'd still have good pull out of the hole, and yet, 2K is not that wound up. If you are not hauling big loads, then you could go with the 342 and then downshift to 4th when you had the occasional load if it seems to lug.

\'59 Chevy 1-ton
'72 c-10 (in progress)
The Great Rust(less) Mountain
\'47 Jeep cj2a