The 3.4L would work with your setup but a built motor is recommended in most cases if your gonna utilize the potential of the Whipple 3.4L unit. If you are looking for a great blower upgrade for a daily driven Cobra the Whipple 2.9L would be the way to go. Stock motor with needed fuel upgrades and throttle body upgrade would put you around 600+ RWHP. As long as you respect your car you should be just fine and have no worries.
If you had any further questions you wanted answered just shoot me a call or email in anytime.
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623-434-5277 ext 2