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I used the MC-3B nose cowl from Aircraft Spurce in front of a corvair. Being fiberglass it was fairly easy to adjust to fit my application. I reshaped the air inlets, reduced the width, added a landing light mount, reshaped the center hole, and cut the whole thing into a two piece. A little time involved but not a difficult task at all.
Appreciate your reply. I am trying to avoid all the modification work. From my standpoint, it would be about a "push" from laying up a cowling from scratch using uood forms, lath as I have done building boat hulls. Some where someone has had to have used a Lycoming 235, 320 or 360 in this application.