Jack,
I can relay a bit of experience we have had with the four cylinder. We used a 1/2 Chrysler Hemi, 180 dg crank and cam, 4 1/4 X 4 1/4, 358 c.i., installed inline with 12:71 blower. Initially experienced vibrations until we had all the cylinders receiving the same amount of fuel. 5200 rpm, 314 mph in Comp Coupe. Look at Al Eisenbaugh's (sic) " F" motor
George Fields