I agree. Use the Bosch pump and plumb it -6AN. I believe the pump is also from a CIS MK1 VW Rabbit. I ran one with the EFI’D 2332. Maintained pressure well. I didn’t have a swirl tank, didn’t know any better back 10yrs ago. I ran my return line to a “tee” fitting just before the pump inlet. So it would cavitate once in a while. Mine was noisy because it was solid mounted to the pan. I think the CB EFI pump is that same Bosch unit as well, but they wrap it in a thick rubber sleeve.
Remember, get some 2ear clamps:
Or plumb it all with AN fittings. Performance Improvements has all the AN stuff on sale this week.
Pete