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Ok i have the chance to buy a 98 5.4 2v truck motor with 36k miles for $800 bucks.I'm wondering what i would need to do the swap i.e. do i need to lengthen or widen the exhaust?Do i need to change k-members to drop the motor down?Will stock 4.6 exhaust manifolds or 4.6 long tube headers fit on a 5.4 with minimal or no changes?Will i need to make computer changes to compensate for the change in cubic inches and if so can i do it with a handheld tuner or do i need a custom tune?I do know i will have to get intake adapters or a diffrent intake.Would doing the swap be better then buying stage two cams,springs and a tune?Right now my car has 38k miles and is in great shape so would this swap be better for the long haul?