All the Chevy RWD motors use the same transmission bell housing bolt pattern. There are 2 starters and 2 sizes of flexplate/ flywheels depending on the transmissions. There are also different flexplate/ flywheels depending on if its an internal or external balanced engine. As long as you got that stuff right you should be fine. Dont forget to check the laws in your area to make sure you can still register the car after you do such a swap. Some places are pretty strict since you will be messing with emissions.
