hi bud,
nice purchase you have there

got some snaps of her?
It has been done by a chap in the Orion owners club that lives round the corner from me. He had the 1.6cvh (mk3 orion) with the twin 40s on but has since swapped to a 2.0 zvh but kept with the twin 40s
your best bet would be to ask him directly though as i have only help installing the engine but i believe its straight forward
if you come over to The Orion Reg forum (see my sig for a link) then pm tockwell (board admin) im sure he would be able to help you out if you need any