I've adapted a Chrysler straight six triple SU HS6 manifold by shortening it and welding it up to the flanges cut from a B30E efi manifold. The carburators came with RH needles which proved too rich. I was thinking of using standard B20 (KN) needles on the logic that B30 is one third bigger than B20 so an extra carburator should have the same needle. Anyone have any exerience with this ? The manifold is a simple one intake tract into 2 ports X 3 with a balance tube between very similar to the separate alloy B18 manifold of old. So far it runs good using a standard B30E exhaust system but needs tuning