Not Ranked
I think Z is 390 and if I remember right, M is 428. Not sure on this.
You can also tell by the harmonic balancer. It has a heavy counterweight on a 428. While there is some counterweighting on all FE's, the 428, being externally balanced has a much larger one. Go find one from a 390 and compare it with what is in the car.
Al
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