Thanks for the responses here. I thought about aftermarket heads but heard how some think the 308's are some of the best non-magnum heads MOPAR ever produced and can perform as good as some of the expensive out of the box heads. I will re-think that and since it looks like I can get a set of aluminum heads for about $1300 that looks like the better way to go. I am assuming that conversion to magnum heads with the additional cost of rockers and push rods will come within $300 of the aftermarket ones mentioned here and they would still be iron. I'm liking the aluminum options better the more I think about it. Also thanks for the clarity and comment on the info I quoted from the Allpar article I read. I doubted its accuracy but am by not means an expert and highly regard and have faith in what I find here on Moparts. didn't make sense to me and he never stated the whys so that took away credibility from the article for me.