Hi Wayne,
Take that lead hammer I sold you, melt it down and use it to solder your tank together
A competent radiator shop sould be able to solder the whole thing together for you and then pressure test it to make sure it doesn't leak.
I know it's too late now, but a new stainless steel header tank is being made by Superformance for all the popular engines. It looks just like an orginal one except made from polished stainless. I saw the one made for a 351W and it is beautiful. $375.00
--Mike