Bubba,
A few questions for you.
1. What compression are you planning on running and with what pistons?
2. What range do you like to ride in .....
3. Do you cruise / race light to light / ride in the mountains / want lots of torque or you looking after high end
4. Since you have these 103+ are you sending them out to be cleaned up / polished etc?
5. Have you done anything in prep to handle all the extra power?
a) Clutch upgrades
b) Exhaust
c) Roller Rockers
6. The problem is bigger isnt always better if the heads dont flow. In some cases the velocity of the air is better used with smaller throttle body.
Let me know the compression ratios because that will determine the cam you should run.
If your going to run 10.5 to 1 as an example
Andrews 60g
Woods 6gh
S&S 585
If you want to go all out then the Zippers 657 / 647
S&S 625
Woods 400g
Andrews 59g
With these cams though you will need to make sure you have first the clearances / tolerances as well as the ability to not have to clearance your rocker boxes. Also your going to need adjustable pushrods. I would also recommend better lifters than stock such as the Screaming Eagles, Fueling, Jim's, S&S
I would also recommend Roller Rockers for your heads vs the stock ones. Once you start reaching 590 to 600 you really should look to roller rockers.
Let me know what your looking for, just remember there are trade offs based on the choices.
-harry