high or low starter

sounds more like one set is for a high torque mini starter, and the other is for a factory very large starter

the mini starters can be had at most junkyards off dakota/rams/ram vans from about 1989 on with v6 and v8 engines, for usually $15 there about 20lbs lighter and spin the engine quicker with less battery power

I'd upgrade the starter first, then you don't have to worry about if the headers will fit