i have a new mechanical pump for my 383.. the stock pump has 2 inlets. the aftermarket has 1 inlet.. the car has those 2 gas lines. do i join them together into the same line to put them into the one inlet or do i need a different pump?

Actually, the stock pump has one inlet, one outlet, and one return.

The return style is a little better for stop & go driving, as the fuel isn't as likely to get warm on its way to the engine. The Carter M6626 fits the bill had should supply a pretty healthy engine.

i have a carter pump i forget the part number.. but so wat do i do with the return if it doesnt have one.. ditch it?

Cap the return line if you're not using it.