use a gas mig welder if you can, just hire it if your just going to be using it for jdm front conversion
use the brand called cig, pretty popular,
depends what welder you are and what settings you are capable of

if you unexperienced i think you should practise on thin sheet of metal before jumping straight onto you car
probably start off with setting amp 1 and wire speed about 2-4, and just work your way up


if your experience crank it up to setting ampage 3, wire speed about 5-6