Both work well. Carbs require less tuning initially than a complete EFI set up with ITB's. Since you mentioned bang for the buck I think they can be ruled out especially Motec... 
No matter which way you go the biggest bang for the buck once done will be to change to a bigger cam profile.
The 3.4 with ITBs that I built a couple years back was a great motor, wicked throttle response, settled to idle everytime, no running issues at all, but we spent the time to tune it properly. Made around 325hp with a really wide power band.
Cheers
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Last edited by Jeff Alton; 11-02-2011 at 06:30 PM..
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