It could definitely be the flex plate, or in this instance could even be the harmonic balancer if the engine you are talking about is a small block. As far as I know, all ford small blocks are externally balanced with the harmonic balancer and flex plate (or flywheel depending on the application), so if either of them has somehow been disturbed, the engine could very well be out of balance and the source of your vibration. That's my $.02, hope it helps!
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65 Mustang Coupe...Comp Cams 262 Xtreme Energy, T-5 conversion, Romac Balancer, 620 Front Springs-4.5 Mid-eye rear springs.......work in progress
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