Hello! I am looking to swap an 5.3 eng and 460le trans into my 85 4x4 stepside. Has anyone on this forum done this? Any info is appreciated. I already have drivetrain, gas pedal, ecm, mass air flow sensor. I am looking at speartech or s&p for the wiring harness and reprogramming. Anyone know if someone makes long tube headers for this? Does anyone have suggestions about running a blazer gas tank vs the stock twin tanks? thanks in advance for any help or ideas.