depends on your mechanical ability, and the performance level you are looking for. an original stock 289/auto setup could be found for under $1000, but then you dont know exactly what you are getting in most cases. a crate motor is the best way to go, you know exacytly what comes with it, and whats needed to get it going. dont forget about linkages, electrical connections, hoses, belts.....this kind of nickle and dime stuff will kill your budget. make sure you know what you need for the engine. look at how the last guy pulled the original motor. i parted out a car, and took the engine/tranny/electrical all in one shot. everything from the battery back. when i sold the motor/tranny, the guy paid extra because i had everything he could possibly need. if the same happened to the car you are buying, you are gonna need lots of little stuff. also, a 289 is probably harder to find than a 302, so watch out for a 302 as well. a rebuilt motor/tranny will cost several thousand. if you could manage to find someone that is selling a used crate motor with good milage, thats gonna usually be the best bang for the buck. you'll have to keep your eyes peeled for the right deal....