After I put a 455 in my '72 LeMans Sport vert I added RA manifolds and custom 2.5" exhaust with Dynomax Super Turbo mufflers and it is perfect.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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