Look at the Crosswinds brand of intake. They are relatively cheap, have dual bolt pattern for both LA and magnum heads and have the bosses there for the injectors. Then al you need is for the bosses to be drilled for the injectors. No need to weld in bungs. I know that Crosswind is a chinese knockoff and not very high on anyones list of decent intakes but with EFI you aren't worried about atomization of fuel in the runners so they are acceptable.