I used to have a -66 Mercedes W111 250 SE Convertible. It had a Bosch Kugelfischer mechanical injection pump (same as in some Porsches from the era) and the standard set-up was a Bosch continuous flow electric pump (virtually bullet-proof, my original pump ran perfectly after 50 years) with a return line to the tank. There was a pressure regulator on the return line that kept the pressure high enough to feed the injection pump. This kept the fuel cold, never any vapour locks. That car was nowhere nearly as attractive as the Austin-Healey, but I must admit that the engineering and parts quality were far superior. That is actually one reason why I sold it, I like to tinker with my cars now and then but the Merc was so problem free that I ran out of things to do once I had sorted the interior and some other issues. I don't seem to get to that point with the Healey, always a little something to fix.