Originally Posted by thekcbeast
ok i think i would probably go with a carb intake and an adapter,because of the cost. and also what about the computer,and all the extra sensors such as the o2 sensor because my truck already has " true dual" exauhst?
You need to reuse the '87 sensors or replace any that are missing from the '87, including welding on an O2 sensor bung to use an O2 sensor, else the ECM cannot go into closed loop operation.
If the '97 Vortec engine is stock the ECM might work fine as-is. If not, or if you want to run a bigger cam w/less vacuum, you can have a chip burned for it by tbichips.com or others who do this. An injector change to the 7.4L TBI injectors might be needed as well.