5.0 Man I don't think you will have a problem with the comprssion and S-Trim. I run same compression on my Notch with 347, only difference is I'm running a Pro Charger with a 3 row Inner cooler, and you can get the mondo from Vortech if you do need it. I was going the Vortech way my self but went with the Pro Charger only because of Product support in my area was better. I am totally happy with mine and NO problems so far with about 10k on it. Your # should be easily reached, and better if tuned properly.
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89 Notchback 347 Trick flow heads and intake bbk full length headers 3.73 Pro Charger with 3 row intercooler and much much more
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