I have a 79 f150 running a 300 i6 with a manual 4 speed. I am swapping a 351 Windsor and I wanted to know if I have to find a new ECM for it or no. That is my main question. Thanks in advance for any help provided

 

Definitely. The computer made for a 6 cylinder engine will not operate an 8 cylinder engine, nor vice-versa. Best to grab the computer for the v8, or one out of a truck with similar engine. And grab all the wiring harness and sensors and actuators (AIR, EGR...)
Or install a carburetor and avoid the computer hassles.

 

This may be dumb but it is going to be carbureted. But Im just wondering about the little brain on the truck now

 

there is no computer on a 79, unless it had a fuel injected engine put into it.

now if you are talking about the ignition control module, as long as it has a black grommet on it it should work with the V8

 

Awesome thanks alot for your help