Twin, I found a sight that has GPS co-ordinates of all the wrecks in the lakes. If I find it I will send you the link.
You sound like you know the lake pretty good. I have really only run to PIB on Erie from the Detroit River and from Leamington. I had to do the trip from Lighthouse Cove on Lake St. Clair at least once. That is where my boat lives so must of the time I'm out there. I did go all the way down the St. Clair River and up Huron to Grand Bend last year. That was a long but great trip. You can be tour guide this summer!
I currently have an 86 24' Liberator with twin 260 HP SBC's (for now). I am just finishing up the winter upgrades. She got new drives, props, tie-bar, carpet, vinyl, dash panels, switches, controls, gauges, steering wheel. Everything but paint and motors. Oh ya, added 2 subs and another amp too! Can't wait to get it finished and out on the water. I want to splash in April for sure! Us crazy Canadians can take the cold.