The 455 HO and Super Duty engines were race horses with the reigns pulled back tight.
The 068 cams was WAY too small for one and the engineers knew it. Problem is that the long overlap of the 041 cam made it next to impossible to get them thru emissions.
Below is a cam I used in a 1973 Super Duty engine built here, and the dyno chart. It clearly shows great potential for making power, but even with a modern roller cam profile having 230/236 @ .050" specs it's still leaving a LOT of power on the table.
Look at the cams Nunzi and HO Racing recommended for them sometime, althought they look like a LOT of camshaft on paper they are what was needed to bring out the true potential of those engines......IMHO.....
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https://cliffshighperformance.com/
73 Ventura,
SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),