Hmm, again I wrote a confusing post. The manifold you want is not a stock manifold from a Monster, SS, or Paso. Those are all for down draft carbs. You want a stock manifold from a Pantah engine, or one of the Malossi manifolds for side draft carbs.
Is there any writing on the rear manifold? Pull off the back carb and see if the inside diameter matches the port in the head well. The bore of the carb should match the bore of the intake manifold, and should match the bore into the head. All the same diameter, and nice and smooth.
You may be able to ask the previous owner if he has it. You never know. Maybe he made this modification just to prove his plumbing and brazing skills. I'm guessing he either used an old P-trap from under the sink, or found a spare exhaust pipe to cut up. What did the guy do for a living (besides torture defenseless Italian motorcycles)?
38mm carbs are a touch big for the 750 Sport. Generally, a 36mm carb is about max. It will run, but it may not run well off idle. But then again, they are flat slides, and the Kehins run 39mm for the 750. Once you get a correct manifold, you can assess the situation more completely.
As for fuel running out of the carb when tilted, check the float bowl settings, and see that they match the spec from Mikuni. All carbs on bikes are tilted to some degree, so they are generally pretty tolerant. Check the specs to see for sure. Since all is suspect, check to see if that carb was made for a 4 stroke, or a 2 stroke.
Is there a fuel return line in the Paso like there is in the Sport? I wonder if the fuel pump is overwhelming the floats?
Fun project though.
Cheers,
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Hi new 2 forum and have just brought a 750 paso.It has come with some head aches ie,flatside mikunis have been installed which is good but the manifolds are of unequal lengths, the rear one been standard and the front one in a c shape to keep the carbs level and more or less side by side.The c shape one back fires when applying throttle as im looking down both carbs 2c if the barrel slides r moving simultanlously.So i just want some advise on where 2 go, is it the manifold or carb balancing or both as im new with all this but have the ability 2 do the job myself and no more about my lovely machine as this great forum helps people like myself 2 have a go and if all else fails 
take it in 2 the pros 
. for a fault finding mission ' I think you would be waisting your time bothering with that set up . The best engine tuners in the world couldnt get that to run acceptably
Just trying 2 keep costs down as i paid 3500 nz$ with 75000klms on clock, average condition and also 2 new tyers and also looking at swing arm mods 2 allow the new rear tyer 2 fit .