I was one of the ones who rented the "jig" when it was in circulation. I think a person could mockup the LA intake on the longblock then make a centerpunch mark down the LA intake manifold holes onto the head deck surface then remove the intake/heads & drill/tap the heads in that location(s) which was what the jig did. If the area on the heads you would be drilling into was solid it would work fine (with the jig it was borderline)