If you've gone this far, get an adjustable fuel pressure regulator. I used an electric fuel pump on my VW powered sand rail for years with a regulator. The engine originally was a 1600 CC 1971 case, modified with a 92MM bore kit and 82 MM stroke (1968cc = about 100 Ci) with a pair of 4DCN Weber carbs - plus other goodies.
That's me and "Crazy Nancy" at Pismo.
Jim