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I agree with 89911, the carbs are nice on a race motor or for a weekend only cruiser, but for a mainly street driven car that will run most days of the week, the Motronic is a better option. Are you running your car on the street with headers and Phase 9's or is this a track car? Are you going to hang onto the heat exchangers, cat and single in muffler for smog testing every 2 years?
I'm retaining the Motronic on my 3.5L twin-plug. Can't run as aggressive a cam profile that I would like with it (thus limiting horsepower), but the motor will get decent fuel mileage and still be smog legal in California. Steve W is coming down for mapping on the road and dyno, so I know I won't be leaving anything on the table as far as the Motronic goes. I think that 260-270 bhp for my motor will be realistic, if I get more than great.
If anything, I would bypass carbs and run a stand alone management system. I've heard of some good increases with otherwise stock 3.2L motors. Some of the systems are not that much more than new PMO's, and should make more power, have better drivability and have better fuel mileage. If I could afford it, that is the direction that I would go for my 3.5L. I know Steve Weiner at Rennsport Systems in Portland has a version and he is reportedly making 265-270 bhp from a 3.2L just by changing the injection. There are others out there as well. Just do a search.
Ralph
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