Just bought a truck with a “good” engine that ended up locking up due to lack of oil from the oil pump they installed incorrectly. I went through and rebuilt the block and tried to reuse what I could. It’s a first gen 350 goodwrench engine and originally had the timing tab on the timing chain cover at 12 o’clock but the one I ended up reusing is at 2 o’clock. The engine is timed by ear but I would like to be able to throw a timing light on it and set the timing a little better. I don’t want to have to pull all the accessories off to replace the timing chain cover as the engine is already in the truck and all buttoned up. So my question is what is the degree difference between the timing chain cover with the tab at 12 o’clock and the one at 2?