how can i get 400hp out of a 318?

318
Bored .040"
10.5:1 compression
stock stroke (3.31)
J heads with 2.02X1.60 valves minor work done 61cc chamber
Weiand Stealth high rise dual plain intake manifold
Edelbrock performer RPM cam with 1.6 roller rockers bringing lift to
.520/.544
750 holley DP
Hooker headers
Stock electronic ignition with orange box.

422 Horsepower
418 Torque