My 66 2+2 421 Tri Power, ran NMCA Pure Stock at 4550 Lbs. Ran 13.60's with iron manifolds, a 276/284 Untradyne cam, 19" of vacuum at 1000 Rpm's. Very smooth. 440 HP @ 5800 RPM's 520 Ft. Lbs Torque @ 3000 RPM. Very smooth street car, "stock" iron heads. This was in 1982. Allot has changed in technology since then.. I could make the same combination produce 30-40 more HP from what I have learned in the last 35 years.
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