the 83 should have the same size valves as any later 5.0...
I just took the heads off of my 82, and the valves are the same as those in an E7TE. It's just that the ports were terrible on the early 80's heads - that and 67.5cc combustion chambers. If you think that the air bump in an E7TE's exhaust port is restrictive, look at these pre-87 heads.
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