Not Ranked
The R model motor would be a beast on the street. Very high compression (11.5-12 to 1) achieved by milling the cylinder heads so deep as to require welding some of the water jacket before milling. Plenty of head gasket problems as a result. My advice would be to can the 60's tech and make a modern motor. Plenty of engine builders out there that can achieve R model hp/torque numbers in a motor that will live well in todays world. The advancements made in cam and head technology have just made the 60's type of work obsolete IMHO.
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"I think we have more machinery of government than is necessary, too many parasites living on the labor of the industrious." Thomas Jefferson
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