The average 408...
Intersting little side note I went to the Blueprint Engines web site and compared their very similar build Chevy, Ford and Mopar stroker engines and even these guys got more HP and torque from the Mopar engine. Here's the spec's.
Ford 408
Camshaft:
.541 Int / .544 Exh & 240 Int / 246 Exh duration @ .050 - 110 degree lobe sep.
Horsepower:
425
Torque:
455
Compression Ratio:
9.8 to 1
Ignition Timing:
13 to 16 Degree Initial / 34 Degree Total
Chevy 383
Stroke:
3.75
Rod Length:
5.7
Camshaft:
.528 Int / .535 Exh & 220 Int / 226 Exh duration @ .050 - 110 degree lobe sep.
Horsepower:
430
Torque:
470
Compression Ratio:
9.5 to 1
Ignition Timing:
16 to 18 Degree Initial / 36 Degree Total
Mopar 408
Camshaft:
.545 Int / .545 Exh & 241 Int / 2467Exh duration @ .050 - 110 degree lobe sep.
Horsepower:
455
Torque:
500
Compression Ratio:
10 to 1
Ignition Timing:
13 to 16 Degree Initial / 34 Degree Total
Now the Chevy is down about 25 cubes so if you take it's HP/CI at 1.122 and multiply that by 408 it comes out to 457 HP. Keep in mind though that the Chevy and Ford both get Dart aluminum heads and the Mopar just gets Edelbricks. OOTB I'm sure the Dart heads are better than the Eddys, but I'll have to do some research on that. They don't state which Dart heads are used though. Also this was not the base alum head engine for the Chevy but the upgraded forged assembly.