You would do better posting this in the Windsor Power section. But how many miles? With a car with some time, miles, on the clock, even with a rebuild some of the secondary systems (TPS, ect) could be off.
Heck even a bad O2 sensor will be enough to turn a runner into a dog.
Just to be clear, "the slightly bigger cam", which sounds like a E303, but you did add that to your Stang, correct?
But again, go to the Windsor Power section for more informed opinions.
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