Help needed MSD Setup

I messed up putting my MSD Distributor in. Can't believe I did this but it's done. I placed the Distributor in place and thought it was down all the way, well it wasn't. I tightened the hold down and started the car. it started just fine and while warming it, it choked out and wouldn't start again. I noticed the hold down was now loose so the distributor dropped in while running. Whats the best way to get back to TDC and everything lined back up?