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Draco,
Greetings to our Canadian friends! I don't know if I can be helpful, but wanted to offer my opinion.
What you build is largely dependent on what you plan to do with the car - and it is largely dependent on geometry. Street cars will need something different than track cars, and displacement geometry will affect life span.
A 351 stroked to 392/393 ci will surely impress you. Ford feels it is reliable enough to market as a crate motor. You don't say what kind of Cobra you are leaning to, but Mark at Superformance in Ohio has said they have had great success with the 351-stroked 408.
I have a 351 stroked to 427 and have heard all the scary stories about rod angles, maximum displacement, yada, yada. I am building a car that I will occasionally drive on the street, take to shows, and maybe take to the track to push it a little. I am not concerned with building a 100,000 mile motor. I am concerned with building a strong, reliable motor. That comes from putting the motor together correctly and paying attention to detail more than it does with pushing the envelope.
I agree with hound dog though, a 393 is probably plenty. Save the extra money and put it towards going to a driving school. Having the horsepower doesn't matter if you don't know how to use it.
Brad
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