the only things i can really think of to boost the power on these little motors is to add a doug thornly header, open air fliter, the usual perfomace things, you wont get any stellar perfomance out of these things. the best thing to do with with the bigger tires is to regear. that will give you the best results, quickest and easyest. if all esle fails, a 4.3L would fit nicely under the hood
