I suspect that what you might mean is that the exhaust system gets
outside the envelope of a lower cowl that would be formed by a ruled
surface extended between the lower half of the MC-3 nosebowl and the
firewall. Is that it, or am I off-base on that guess?

Bob,

The quote above is exactly the problem, hence the need for a more
rectangular nosebowl. So what I'm really after is direction on where
I may find a nosebowl that isn't crescent shaped on the bottom???

Thanks. Don...