I've got a 77, all stock cept for what i've mickey moused. And i don't have the patients to deal with headers, intake, TB, and other 5 hp bolt-ons. I heard a diff. swap from a 300zx will give me results now. Is this true? and how much should i plan on spending at the junkyard. I also don't think im gonna be able to do this myself, so how much should i put away to bribe the mechanic for installation?