I agree, the original game plan was to upgrade H/I/C after the mass air conversion. The combo was AFR165 or 185s heads, Typhoon Intake, and X303 cam. Money ran a little short after the MASS air conversion, getting some upper control arms. My son already had the cam and intake on order. Once it came in decided to put them on the car.
Is it the stock heads that's killing us, or could it be something else like air/fuel mix? My son also noticed that when he's on the road and punches it, gets smoke out the exhaust. We didn't take the heads off the car for this upgrade.
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