AJ's Opinion; what size SBM do I need

I’ve never heard of that formula ether but I like it for a “Old school/old guy” hot rod formula. It’ll work.

A bigger number would work better. But in general terms for an actual street driven car, it’s fine.

Times 11 for good power, street or street/strip
Times 12 for a beast mill.

No build the engine with the amount of HP per Cube math.
This is really where it’s at. The old saying comes into play here. There is no replacement for displacement.

3500 lbs vehicle =
10 = 350 cubes (340 or 360 engine) = street = 1.3 HP per cube. Mid to low 400 hp.
11 = 385 cubes (360 crank into a 340) = S/S = @1.3 is 483 hp
12 = 420 cubes (4.00 or greater arm) Track 1.3 = 546 hp

Stepping up the program…. 1.5 per cube… 350-372-420
525 hp
558hp
630 hp

1.7 hp per cube (wooooo!!!!)
350 = 595
372 = 632
420 = 714