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Dont take my comment as being a jerk cause that is not how it is meant to sound.

You need to get to a dyno ASAP IMO. Your mph tells the whole story, for a 393 stroker it isnt making near the power it should.

I know two guys with 393 strokers both around 10 to 1 compression with box stock edelbrock heads, solid roller cams and a trick flow intake. Where I race the altitude often is around 5000ft. One of them runs a 10.86 @ 123 on motor. The other one wich is really mild runs a 11.92 @118mph on motor.

I would almost bet the cam is a tooth off or something.