Dartfreak75... Quick TQ tuning tips Video I made for you

It should be pretty close then. The 400, though 40 cubes larger and a non high performance engine (via a comparo to the past) still needs a reasonable amount of fuel to feed it. It should have a “1937” 3 step rod (.070, .046, .040) and a .095 primary jet.
.095 - .070 = .025 around the rod into the jet spacing.
It maybe a 1/2 a hair rich until you get the upgraded cam in there. No big thing I think.

Headers in use? That may bring it super close.