Can small block oil pump be replaced without pulling the engine?

Well I DID just this on Vixen a few years ago before I swapped the 225 in. I resealed the pan, replaced the oil pump, rod and main bearings and put a new timing set in her original 170. I could have done it all in the car, but rather than roll around on the ground, I pulled the engine and transmission both. It took Kitty and I less than an hour with hand tools and I had the engine on the stand. With all the other work you have to do to do it in the car, you're going through the same amount of labor.