I think the best solution is to obtain a fuel pressure regulator of the demand type. These examples include units made by Cline and Iron Bay. These systems pressurize the fuel tank through the use of exhaust pressure and a check valve and the regulator does its job by adjusting fuel flow dependent of the demand at the spraybar. No external pump needed (and pump carb as well). One could also dismantle a walbro gas carburetor from a chainsaw or weedeater for the regulator as it works similar to the Cline/Iron Bay units.

Pumps require regulators, and pumps such as the Perry VP30 really should be used with a corresponding pump carb. It seems rare that they work well with a stock carb unless the stock carb is way too big.