I have a 300 6 cylinder wanting to know if a 302 v8?

yes they will change over with no problems.

As others have said, a late model 302 engine will bolt up to your existing transmission. I would question whether you are gaining anything by doing this swap though. The 300 6 cylinder engine has very good torque output, making it an excellent match for a 4x4 truck. If you want more power, then I would look at some performance tuning for the 6 cylinder engine.

Yes, they use the same Windsor bell housing and the transmissions are the same as well

It's best to ignore Racing/Whoelse, he's incompetent for the most part and is just here to spam his website.

The bell housing patterns are the same. As for gears, there is not that much of a difference between the two (if any). The engines still have the same RPM/speed shift points and should not be a problem.

No, it wont, even if it would physics are not that simple as your gear ratios in that transmission are FAR from being designed for the V8 power band.

You can use a car performance simulator to virtually do this kind of swaps and see how the truck would perform with the mod, or other engine/transmission combinations, you can find it at http://www.nxgtrsim.com/

will the electronics match or do i change out the wire harness