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Doug Roe was an original Q-Jet engineer and his book is the best I have ever seen. I spent a week with Doug once and many hours on the phone with him.
The 72 got some jetting and other changes due to the smog calibration the 70 did not have.
There are many reasons for the hesitation, but they can be tuned out easily.
The Q-Jet is something of a pain to get just right, but will run with anything once sorted out and will run 60-75k miles without problems-try that with a Holley!!!!!
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