Fuel pump Questions for Dany's Magnum swap.

I run the carter 6270 with a Summit regulator 6.5 psi, 5/16" pickup bent to tank bottom no sock, 3/8" fuel line to pump, 1/2" to 1 qt spin on filter, regulator and carb tee. With the same setup and stock pump, my AFR fluctuated from run to run on the top end. The 6270 pump solved the problem for me on my 340/400hp.