Yup - the machine shop has the engine back in the car and i expect your pulley will arrive soon, if it isn't already there. When I rebuilt the engine back in 2008, I had two GM mechanics working with me and they believed that they had tweaked the cam sensor timing to 23 degrees ATDC, back in the day (late 80's) as they continued to learn about the car. Normally I would stick with whatever the GM engineers had recommended. If by chance the machine shop has used 23, I just want to know the upside/downside of doing so. Just being cautious here. Engine is bone stock and I am happy with that, and want to keep it trouble free as long as I can.
Phil from Canada