Datsun, please have a little respect for your elders.

A stock 4" bore 350 block with a 400 crank is a 377.
A 350 block overbored 0.030" with a 400 crank is a 383
A 350 crank in a stock bore 400 block is a 372.
A 350 crank in a 400 block overbored 0.030" is a 378.