As stated all of your symptoms are typical for too much compression - too little cam. A compression test would help confirm this.
Curious though, the numbers that you give for .050 duration didn't sound right so I looked it up and Crower lists the cam at 221 int 229 exh. It doesn't change your situation but are you getting the numbers from the cam card?
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1969 Lemans vert, matador red, 462 CI, 3.07 12-bolt posi
1974 455 TA, admiralty blue/red interior HPP "cover car" - sold
"The best way to show a car is to drive it"
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