Check out the Trick-Flow valve spring, retainer shim kit for the Ford iron heads. You get all the necessary stuff including seals to give you some extra space for cam changes for under 150 bucks. I recall about .540 lift being the max. Also, re the split cams, you can mix rockers to make a difference there as well. 1.6 on the intakes and 1.7 on ex seems to work for some of the guys racing carbureted Mustangs with letter cams.
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