Thank you all for the help!
zul8tr that is a great write up on getting the timing nailed down. The same process that I was going to use more or less. I was planning on using my analog dial gauge for this process as well. The mag will be locked at the full advance location as you stated as well but my motor has a recoil on it so I should have better luck with kick backs not throwing the rope at me. Right now it is a very easy starting motor even with it not being adjusted properly yet.
Does anyone have a good place to start with the timing for btdc? I have been told by an old racer that I want it between 0.350 and 0.400 and I will just have to play with it until I find what it wants on my boat and altitude etc. Does that sound right? The main thing is getting the two cylinders to fire at exactly 180 apart from each other. I know the service manual for a mark 28 calls for 0.275 but I am not using this block for what it was intended so further advancement makes sense.
Thanks again for the help
ryan