Need help with 440 break in

I am getting ready to fire up my 440 for the first time but want to be sure to do it right. I have too much time and money in this to mess it up. Here’s the specs, 10.7 compression, stealth heads, rpm intake

First question, I have ceramic coated Schumacher headers installed. I just spent the last 2 days trying to get them on and then remembered I was supposed to use the stock manifolds for break in. Can I get away with using the headers with out damaging them? Or do I need to pull them back out.

Question 2, when I fire it up what do I want my timing to be at if I am running it at 2000 rpm? I have open headers so I’m not sure how well I’ll be able to hear any ping. I do have a timing light

Question 3, How do I tune the carb without the motor running? I know it needs to be a little rich to be on the safe side but I don’t want it to flood. It is a new Holley 750 Model 4160. Here’s the cam specs;

Grind: HIFLOW1H
LOBE SEPERATION ANGLE : 108
OVERLAP : 80
INTAKE OPEN : 40
EXHAUST CLOSES : 40
INTAKE CLOSES : 76
EXHAUST OPENS : 76
RUNNING CLEARANCE : 0.00 HOT
VALVE LIFT (INT/EXH) : 0.472 / 0.472
DURATION (INT/EXH) : 296 / 296

CHECKING FIGURES AT .050 TAPPET RISE
OVERLAP : 12
INTAKE OPENS : 6
EXHAUST CLOSES : 6
INTAKE CLOSES : 42
EXHAUST OPENS : 42
DURATION INTAKE : 228
DURATION EXHAUST : 228
LOBE LIFT INTAKE : .315
LOBE LIFT EXHAUST : .315
INTAKE CENTERLINE : 108
ROCKER ARM RATIO : 1.50

Any other info I may need would be helpful as well. I’ve never broke an engine in before and I’m on my own other than FABO.