The last cam I did I got a surprise. It was way off, and I had to retard it to get back to 103! Luckily, it was a pig of a 350 SBC that needed all the cylinder pressure it could get. So for my put it in straight up dot to dot, check it, then if it is a stock short block which tend to be low on compression, I would advance it to less than 108, maybe 104 as a starting point. If you think the cam is fairly modest for the surrounding parts, gears, etc, then try 108. For the most part, advanced won't hurt you as much as going retarded.