If you were planning to use the cam I penned, you do not need Rhodes tappets. It was designed to provide drivability, good vacuum at idle, and low rpm power as-is. If all components are set up as they should be the engine will make peak horsepower at 6500 and want to pull well above 7200 rpm.
I do not recommend revving the engine beyond 6200 rpm however unless the engine is equipped to survive operation above 6200 rpm.
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