This was more than 20 years ago so there might be better ways now.A friend had a big block crank trigger locked advance dist setup that would crank slow when hot.I put an MSD programmable computer on it and set the mechanical advance back up in the dist to match the computer,still using the crank trigger for the siggnal.Never had any trouble after that,even in the late rounds.I still see that car with that setup now.Bill.