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A hydraulic roller swap is a logical choice. If you're wanting a lower rpm range now, there's no use in incurring the risk of a solid roller without reaping the benefits of a solid roller...
You will need a valve spring change, as well as a cam and lifter change. You could do the swap for around $1025 including the camshaft, lifters, valve springs, and retainers.
Most of your off-the-shelf Ford cams will be based on GM patterns....6° intake/exhaust duration split, 110° LSA, etc. If you want to get the best bang for your buck, you may think about going with a custom camshaft.
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