Stop in for a cup of coffee

Mattax said
Watch out for the spring force. Its too high on some of the Carters. Should max out around 6 psi, not 7 or over.

In the aftermarket
Carter M6902, if available, should be good. M6720 is not - pressure too high.

The Holley '110' mechanical pump p/n 12-360-11 has been a solid performer for me.

Mechanical Fuel Delivery for Mopar LA Engines

Mopar Performance and Edlebrock had 6 valve pumps which should work fine but only IF installed on an engine with a '69 down water pump.