A-v8

[Jack Shaft]

V8 is 221 or 239 cubic inches across 8 cylinders

Model A is 200 cubic inches across 4 cylinders

The biggest difference is counterbalancing and pressurized main bearings,critical for sustained high speed driving.This can be done to an A relatively easy..the rest is fundamental,the A torque rise when total horsepower is doubled through bolt on modifications along with an overdrive you're in V8 country