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From this angle, what might seem like an ordinary '66 389 Tri-Power engine is actually a well-disguised 469ci engine that features 10:1 compression, ported No. 64 cylinder heads, an aggressive hydraulic flat-tappet camshaft from Nunzi's Automotive, and four-tube Doug Thorley headers. Those aren't Rochester two-barrel carburetors, however. Atop the cast-iron Tri-Power intake manifold are three IMPCO 125 CNG mixers, which act like conventional carburetors, but instead deliver varying amounts of natural gas vapor for normal engine operation in all conditions.