Agree carb way too big...068 cam too big for those 93 cc heads. Optimal cc should be in the 72 to 75 cc range.
My calculations based on your setup is 7.59 to 1 compression.
My first change would be a set of 72 cc heads...1968 #16 1969 #48 #12 1968 #18 350 HO. You need compression brother...you are pathetically over carbed, over cammed and under compressed. Changing the heads only at first will alleviate most issues...then if still dogging, change to a smaller 750 q jet.
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1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
