[427sharpe]

Almost any part for a 302 will fit a 289, except parts of the rotating mass. I personally believe that the 289 is a bit superior, just because it seems to rev a little faster. I real terms though, I do not think you would notice any real difference unless you are going for 100% authenticity. I can tell you for sure that 289 blocks are a heck of a lot harder to find....If you go searching about, look for a Mexican 302 block (which will say "Hecho In Mexico"in the lifter valley (under the intake). THe advantage to these blocks over the plain (non Boss) 302's is that they were cast from a better content of metal, and the main caps are thick and solid as opposed to tapered like the plain 302. This is because the Mexican 302's were cast at Hermisillo, the same plant that cast the K code 289's (the 271 hp version) and they have many of the same features as the hp 289. Look for these 302's in service and other hd use trucks in the yards..they really aren't too hard to find. To go all out, DART casts an excellent 302 block for hp use at a reasonable price. Just depends on what you want to build around...max perf or max originality.