You could use something like an SU type electric pump as fitted to lots of early '60,s '70,s cars, Triumph Stag, Some Jags etc. Earlyish Petrol Sherpa vans/ Rover 214/216 had a nice little compact unit about the size of a plastic fuel filter that was fitted in line up at the back of the car. I had this type fitted on my Pinto powered Ford Pop......never gave an ounce of trouble. On the electrical side, you should fit a relay AND a fuel cut off inertia switch for safety in the unlikely event of a collision. Its a bit trial and error, but you may also need a fuel regulator.
I am thinking of changing my existing fuel pump on my 1973 Rapier Fastback, to an electric one. Has anyone done this and can they give me some advice please? I hear that this can cause problems if you fit the wrong type.