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Message: <blockquote data-quote="HighTechRedneck" data-source="post: 1718205" data-attributes="member: 588262">The computer is not that big a deal as long as the wiring harnesses fit with the swap out motor. The ECM (Engine Control Module) on most GM vehicles is mounted under the dash behind the glove box.If you have a resistor chip in your ignition key (a black computer chip on the key shaft itself), then you have to know the resistance value (Can be read with an Ohm meter). This is the VATS (Vehicle Anti Theft System) that is also controlled by the ECM computer. You will need the ECM for the 350 which is about $135. Since you are changing the entire computer, you can't use the old EPROM IC chip for the new computer, so an additional $200 for the chip for the new computer. If you want to take a chance, check the junk yards for a used one. Hopefully you can find a good computer cheap.</blockquote>