It can be done, but it isn't necessary, and probably not even desirable.
The normal methods of fitting the header into the head, and bending the mounting brackets to ensure a straight-in fit, can work fine. If the fit of the header into the head is loose, the aluminum wrap method works fine, and I have done it on many Bullets. If there is any problem showing up with these methods, it is 99% sure that the header is not mounted properly, and the brackets need bending to the right shape to ensure that the header goes straight into the head.
If you feel like you have to do it, look up the Royce Creasey article on a non-welded method of doing it.