Yes, another timing question!

Trying to get the timing sorted on my 440. Feels a bit sluggish out of the gate. Problem is, I don't know the specs on the cam, since the motor was in when I purchased the car. It doesn't sound stock, but it's not radical either. It has a stock distributor, Edelbrock Torker 2 intake, iron heads, TTI headers and a Holly Street Avenger 770.
I have the vacuum advance plugged. Total timing is currently set at 38 degrees and initial at 14 degrees. My question is, how do I know this is correct and how do I go about getting it spot on?? After adjusting the carb for maximum manifold vacuum, where do I go?