Max RPM on mostly stock 400?

Oiling would be my biggest concern. I had a 383 that liked 7000+ but it eventually could not keep oil fed to the last pair of rod journals. My 440 has HV pump, extra capacity pan with trap doors and kick outs, and 1/2" pick-up.

440 has Eagle rods, light weight Ross pistons, 0.990" pin, solid lifter flat tappet cam. I have the 6AL 7000rpm chip installed and occasionally bump into it.