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the 88-93 5.0L aluminum EFI valve covers are great for this as you can cut out a 1" wide stip of aluminum just over the rocker studs and adjust rockers whilst running .
with as many variables you have , i am feeling the pushrod length is off, and your push rods are too long or too short.
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Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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