Why 400 heads? They are notoriously bad flowing heads without much modification
the engine would be about 360 cubic inches, but the heads have nothing to do with the size of the engine.
460.36 cubic inches
A 262 bored 30 over.
a Chevy 350 bored .060 over would be 360.4 cubic inches
If my math is correct , just over 311 cubic inches ( using a 3.875 inch bore and 3.250 inch stroke bored out 30 thousand )
It's exactly 360.42 Cubic InchesStock Stroke is 3.48 60 over is 4.060 BoreTo make a 383 stroker you need a 3.75 inch stroke crank, and 4.030 BoreActual displacement is 382.67 Cubic Inches
413 cid
388
A 350 starts out with a 4.000" bore and a 3.48" crankshaft stroke which really only gives you 349.8 cubic inches. (Chevy rounded it up to 350) Your engine which has the same stroke of 3.48 but now is bored .030" over (making the cylinder bored size now 4.030) total size of 355.1 cubic inches or just a 355.
455 bored 30 over is now 461ci
406 cubic inches .
A 327 chevy bored .10 over would be 4.1 bore x 3.25 stroke = 343cubic inches or 5.6 liters
377