Just seen these....Wonder if they will fix everything so you don't have to weld them. Seems like they would.
http://www.industrialinjection.com/shop/product/lb7-cnc-ported-heads-with-torque-lock-injector-cups/
http://www.industrialinjection.com/shop/product/lb7-cnc-ported-heads-with-torque-lock-injector-cups/