....I noticed you mentioned something about 11 1/2 to 1 compression & 291 heads which I believe are iron heads. This might be too much for todays 92 octane gas {please disregard if your already aware of this}. And although I'm certainly not qualified to pick out a cam/heads/manafold/converter combo for you {others on the site can} I do know that your combo is mis-matched. Meaning that your stall is too low for the cam, the performer air gap manafold doesnt' match the cam/compression, etc.... hope this helps ya. Bill