Yeah if I was gonna do it again, I'd get a 331 or 347 short block from DSS or CHP and then piece together the top end myself.
Do you want 400 flywheel hp or 400 wheel hp.?
For 400 flywheel hp I'd do a 331 with AFR 185 heads, FTI cam and a Holley intake
For 400 wheel hp, you'd probably...