I'm trying to figure out the best place to mount the engine so I rigged up a locator with a 10 ft piece of tubing. There is a bushing in the tailshaft and bracket on the front of the block that centers the tube in the main bores. Now I can see if the engine is square to the frame and if it is pointed at the rear end. I'm also in the process of locating the rear end so this helps with that. It will also help me get the pinion angle dialed in.