You"re right as usual soundguy. There is enough meat there to cut away to slip the nuts on, but the spacer idea doesn"t really have enough room without increasing the slots outward. Otherwise the studs to the manifold would interfere with the screws to the carb. I don"t have anything trustworthy to cut the manifold so off to the machinist they go.
It"s never as easy as you want it to be. Such is life!