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Dear Blain,
I think I have answered some of your questions else where but to give rundown usefull to as many as possible I have some broad recomendations.
First a constant vacuum (pressure) cab such as an SU is good in as much as it is almost impossible to over curburate the engine. Remember they ony open up as much as needed not as much as the driver thinks they need be.
The SU Stromberg and all similar carbs have the potential to be super high milage carbs in as much as they will deliver a well atomized mixture to the engine. They can also deliver an extreamly wide range of air/fuel ratios accurately. The problem is that giving what is needed boils down almost entirely on how acurrately th carb needles are profiled. As a do it at home deal you will need as a minimum an O2 sensor in each exhaust bank and I would recomend in each ex. pipe as optimal.
The idea of putting this type of carb on a dual plane intake is a sound one. I would say that a pair of 2 inch SU's would support about 300 hp on a well set up engine. Our milage testing with this type of carb on a Mini engine indicated the water heating the intake gave better results than exhaust heat (which appeared too much) or no heat.
I suggest you convert the heat cross over passage of a good smaller port two plane to water heating.
Hope all this helps,
DV
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