Can you use a 289 motor in our car? The car that I am trading for has a fresh 289 and I want to keep my 347 and supporting hardware. Can I make that 289 with heads and all work with fuel injection?
Yep, it's the same block, for the most part.. The 289 uses the same 4.00 inch bore with a 2.87 inch stroke, versus the 3.00 inch stroke of the 302. IIRC, the 289 doesn't have a provision in the block for a dipstick. I think they were located in the timing cover, or oil pan.
Make sure it's not a early, before 65, possible 64, as they can have a different bell housing bolt pattern. Otherwise, as stated the dipstick is located different. Use the fuel injection intake and should be no issues using the 289.
It'll be flat tappet lifters and the 302 firing order, versus the 351/5.0 HO order. That's a simple cam swap to change, however. If you need a T-5, the Fox ones are more plentiful, but you'll also need the Fox bellhousing, clutch fork, and a driveshaft spacer, or lengthened driveshaft. You could always pick up a Fox T-5 and swap in the 94-95 specific input shaft, too.
If you go with an off the shelf roller cam, or even the stocker, you'll need to run retrofit lifters (expensive!). A flat tappet 351W cam would be tons cheaper, but you'll need to swap your distributor gear to be compatible with it. You could also run an off the shelf reduced base circle cam and do a roller conversion that way. It's not the preferred method, but it is another option, and wouldn't require the distributor gear swap.
Those roller lifter conversion kits cost a fortune. The only downside to moving the spark plug wires to a different sequence is that the injectors will not be opening in the same sequence as the valves opening. I think it will still run though, just not as well. You can make extension harnesses for the injectors and swap the sequence on them too. It would take a little bit of work.