'The 383' ~ Getting Those True Factory Horsepower Ratings

Bean Man,

Here is what Plymouth posted in November 1967.

1968 Plymouth Road Runner '383' {Coupe}
* 4-Speed {Inland Shifter}
* 3.55 Gears 'Sure-Grip'
* F70 x 14" Tires

Best Performance ......... 14.74 @ 97.60 MPH
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Performance Upgrades
* 26" Heavy-Duty Radiator
* Viscous Fan-Drive
* Fan Shroud
* Dual-Point Distributor
* Champion J-10Y Spark Plugs
* High-Performance Ignition Wiring
* Accel Hi-Performance Coil
* Performance 'Advanced' Timing
* 3.91 Gears
* Hurst 'Competition/Plus' Shifter

Best Performance ......... 14.29 @ 99.07 MPH
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Bolt-On Goodies
* Edelbrock DP-4B Aluminum Dual-Plane High-Rise Intake
* Holley #3310-1 {780 CFM} Carburetor
* Casler 7" Wide x 27" Tall Slicks
* Adjustable Pinion-Snubber

Best Performance ......... 13.98 @ 101.49 MPH
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Performance Add-On's
* Holley High-Pressure Fuel Pump
* Hooker Headers {1 3/4" Primary x 42" Tube-Length x 3" Collector Outlet}

Best Performance ......... 13.75 @ 103.88 MPH
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Camshaft Swap-Out
* 'Hydraulic' {.484" Lift ~ 284* Duration ~ 68* Overlap}
* Matched Lifters {-.0005" under-size ~ 'Low-Friction'}
* Double-Roller Timing Chain

Best Performance ......... 13.60 @ 105.50 MPH