Tuning the Monster!

[Thad]

Hey there everyone. thanks for the insight on my whistle sound problem.
Now that i've taken care of that part there are some other tuning factors that i'm not to sure on.
Let me start with what i have engine wise. It's a stock 302 bored .030 over. Running with a F303 cam, 24lb injectors (light blue ones)which i just changed all the seals on.
An Edelbrock performer intake with a 70mm TB
and fender well cold air induction(BBK)which i just changed all the gaskets on too. I've eliminated the whistle niose that i had and have come into some other questions.
I checked my timing,vacuum, and fuel pressure. The timing came in at 20 deg adv. and backed it up to 10. the fuel was at 30lbs and backed it up to 23 lbs. and the vacuum is running extremely low at 7 or 8 when i think it should be at least 15.
what should the settings be at for optimum
performance? Do i just need to mess with until i hit a good combo.
It seems to be running good but it has a little backfire when it comes back to idle after reving.
Sorry so long! Any advbice would be great.
Thanks, Thad
I almost forgot . I also have an MSD ignition 6AL.

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90 LX 5.0 Not timed in 1/4 mile yet. 135mph max speed, so far.