I know a guy raced 50 plus years same cuda
Bought it brand new 69 cuda a56 340 auto
Not a blue printed motor
tried every cam every gear ratio every intake all the carbs
His final combo stock cam advanced abit tm5 single plane door stop 700 dp 50s street tires everything else stock including the mufflers quiet as mouse all you could hear was the motor 1 Hell of a sleeper car ran 13.1 for 40years
Basement filled with trophys from sunday racing at new england dragway
He had a stroke didnt race a couple years took it up for grudge night i saw it run 13.3@101 blowing black smoke out the cuda tips it bogged the carb was trash from sitting
Nothing but intake and carb on top of that its the intake everyone calls a door stop on here