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Are the aluminum heads really worth the effort? Considering the cam I have and the set of J smog heads I have, would I be better off using the iron heads? Am I really going to see that much difference in performance to justify spending at least another $1000 for new valves, adjustable rockers and pushrods? The more I think about it I am inclined to cut my losses with the aluminum heads and use the J heads. What would you do?

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I would determine the actual compression ratio with both sets of heads, if it above 10.0 to 1 with the iron heads and close to the same with the aluminum heads I would run the aluminum ones I wouldn't run that much(10.0 to 1 or above) compression with pump gas with the iron heads