Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
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Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
TonyPanchot
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Does anyone have information on swapping the 150 for a 175 on a 73 1500 Spit ?
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Spitfire Carb Upgrade Spitfire
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TonyPanchot
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No I have not, Thanks for the tip
dklawson
Yoda
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The dual SU setups have become a bit expensive. You can also convert your single Stromberg to a single SU HS4 by slotting the HS4 mounting flange. That's a fairly easy change. If you want a bit more carb you could move up to a single SU HS6 but you would probably need to enlarge the manifold entrance hole and re-tap the standard manifold flange to accept an HS6.
OP
TonyPanchot
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I doing a bit of research and since I enjoy my triple set up on the 250 I see that a co called PRI has an offering that makes a lot of sense. Performance, fuel economy and reliability.