I'm helping a friend convert his '69 Camaro from Pro-street to Pro-touring. The rear-end is narrowed, so we need a backspacing of 3.375". The 18" wheel he wants to use has a minimum BS of 4". I see the Skultz company has a billet .625" spacer. He has long 1/2 ARP studs. What would be the pro/con of TIG welding the spacer to the wheel?