I have added a fitting to several carbs to allow for a external pulse pressure feed to the pump. A 8x32 Dubro fitting works well, but other fittings would work too. Depending on the fitting you might have to file a little off of the threaded part to have it come out flush on the inside and not touch the pump diaphragm.  If the carburetor mount block permits it, you can drill and tap a hole there someplace to match a carb's pressure hole in the base of the carb too.

Here is one where I used a 8x32 Dubro fitting on the pump cover.


Here is one setup with a right angle fitting modified from a boat engine fitting.


Here is a SV engine setup with a external pump pressure feed line. It is the black rubber tube running from the back of the engine to the front of the carb where the pump cover is.


Here is a example on a engine of using a external pulse feed to the base of the carb to match the pulse feed hole on the base of the carb. Quite a few engines do something like that too.