Slow down there guys! The radiator he has is aluminum, he will need to find a shop that can weld aluminum, most of the radiator shops I have delt with over the years only work on copper units that they can solder.
ok well that may be the case where you are ...but with the advent of the newer radiators being alum & plastic MOST in the metro Detroit area can service either/both Copper/ALum...moving that neck should not be a stumbling block for any sizable rad shop...esp one that does custom rads since most of them are all alum