Maybe Hemi Joel with a straight eight 420 Duesenburg. Stroked & bored, sheet metal intake, two fours, zoomies...
Since we are just bench racing here, let's run this thought out.
Model J - Naturally aspirated - DOHC, 420 ci, 3.74" Bore, 4.76" Stroke, 5.7:1 compression - stock - 265 Hp @ 4250 RPM - That is a bit better then 1972 454 ratings......
Assuming one could afford to play with one of these motors (they make SOHC's look cheap), could it be competitive??? All practicality aside....
First order of business: Bump the compression up to a realistic number, probably custom pistons, something to work with the hemispherical combustion chambers. Bore to help unshroud the valves...
Custom Cams to help it breath.
Will the bottom end and rotating assembly hold up at 6300 rpm??? With that stroke, piston speeds are going to be in Pro Stock territory - Custom Rods required??? Bearings??? Torque would be diesel like with that long of an arm.
Can the intake and head be modified enough - with in the rules - to achieve acceptable flow??? The siamese intake ports aren't going to help here.
Werby - Is the Gonkulator up for such a task???