The 85 stock heads suck. This should be number 1. get anything other than what you got. Second is your car a carb or is it CFI? If its CFI, get rid of it and get a carb and a performer intake. But, you said you dont want to dive into the engine to much. You could just through NOS at it and get that power level, but I would not do that with 107K on a stock engine.
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