I have an RPM on a 455 in my 68 Firebird and also use the 4X-7H heads. I havent put the front clip back on the car but by taking some rough measurements the RPM is going to give me a little hood clearance issue. May just go with a high-rised 400 hood. But I would deffinetly recommend the RPM like these guys suggested.
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A.J. "Bulldog" Murphy, MSgt
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