They are basically the same engine, the 289 just has a shorter stroke, resulting in less cubes. This can be an advantage for hp because it will wind up higher easier. On the other hand a longer stroke (302) generally makes more torque, which is what you want in a heavy or off road vehicle. Our EB's are both. You can build a 289 to do whatever you want, and they are great engines. Ford quit installing them in early 68 and went to the 302 from there on out, and a newer version is the 5.0, which is the same engine. The 5.8 (or 351 W) is also the same basic engine, but the cylinders are longer for even more stroke, which also makes it a little wider at the top of the "V". This is also how the 351M and 400 were created from the 351C. There are some other differences, but same basic block. If I remeber right, the 351W has 3/4" higher deck to get the extra cubes. And I think the only real difference between a 289 and 302 block is deeper bores to help with the longer stroke (although I have seen people build a 302 with a 289 block). All of this is coming from memory, so don't hold me to any of it!