Re: performance increase from tri[le strombergs??
I've had the triple carbs as well as my current setup, dual HS8's.
My take on the triple carbs, nice but in my case, I spent ALOT of time tuning them to get good idling characteristics and performance... try as I might, I could just get my setup to idle below 1300rpm. Another problem that many people that has had the tripps, is that after they get hot the linkages start binding a bit, which caused the idling problem I listed above. Performance was definitely better than with the dual ZS carbs, but then again, I had added cam, compression and headers at the same time.... but they looked SOOOO cool!
The Ratco throttle linkage is a must.
If you read Kas Kastner's book, he says that the dual carbs are good for 175HP, but I think he was making custom needles and the like... I think that you might want to seriously consider dual HS6's or HS8's. Like I said before, I went the HS8 route and I like them a bunch more than the triple carbs, but that install isn't for the faint at heart; You have to get the intake manifold bored out to fit the HS8 and you have to fabricate the choke linkage and fuel lines. The HS6 is a much simpler installation, plus there are a billion needles for them. I'm sure with a little time, you could get a dual HS6 setup to run at least as good as the triple carbs.. with no mussing with linkages and the like.. either way, I would still get the Ratco linkage.. it's great thing.
Here is my HS8 setup with a custom dual-layered stainless heat shield.. it's not as cool looking as the triple carbs, but it goes like stink and the intake sound is MUCH, MUCH louder.