I have recently looked into using a Weber 55 DCOE side draft carb.
Pretty cheap at about $560. I was surprised. Not easy to lean the mixture as
it is a
very complicated carb. It will work but the idle will be pretty poor
as it must be mounted on the beginning of the p-port intake runners.
The throat spacing is too close to mount it near the P-port rotor housings.
Besides that it would be subjected to the full heat of the exhaust manifold.
Power will
be somewhat down compared to a slide throttle due to the aerodynamic
drag of the butterflies and throttle shafts. I don't know how much. If you
take out
the throttle shaft and butterflies and use a slide throttle you will
lose a lot of functionality like the accelerator pump for one example.

It should work fine unmodified at low altitudes and with a modest HP
penalty.

Ken Welter has been flying a Weber for a few years on his Coot. I think he
is tricking the float chamber by using dynamic air pressure to lower the
fuel level.
I am not sure. I don't fully understand what he is doing. Perhaps that is
possible with a needle valve.

Paul Lamar ...No rotor no motor.

It was my understanding that (for flying or Pikes Peak) the Weber is jetted
with the choke on then as you climb you lean by backing off the choke.  I
wonder up to what alt. that works to.
Ernesto

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