Looking for info on the most suitable size/type of fuel pump tp suit 24 LB injectors and a Malpassi rising rate regulator 1.7:1.

Bosch/ Walbro ??

So I take it that because you are running a 1.7 rising rate reg it is on a turbo car, so it is more important that you look for a fuel pump which maintains flow under higher pressures although probably not a huge deal until you are over 12-14psi. The walbro high pressure series pumps are very good and will still flow plenty at very high fuel pressures.