Need help on centerlining my cam.

OK, while I'm waiting on my replacement bolts. I want to centerline my cam. I used my dial gauge to get the cam in straight up. The instructions that came with my comp cam said to use a solid lifter and have the heads bolted on the engine. I have just the short block setup right now, I didn't want to put the heads on until I had the cam degreed in. How do I go about doing this?