The headers are definetly on the small side. A set of 1 3/4" super comps would be a good investment. I went went high 8's with those on my car.
As for the fuel. At 10.5 to 1 I think the 100 is plenty. You will make the best power using the lowest octane you can without detonation. If its not detonating on the 100 I don't think you will see an improvement with the 112. Was the motor dynoed with that carb? What fuel was used on the dyno? Due to the change in specific gravity of the fuel the carb may need to be rejetted to compensate. It's probably going to run rich with the 112 in it. Since you have it try it but I don't think thats what you need.
Why do you think you need airbags? I'm not a big fan of them. Let me know your answer and I'll elaborate.
Get some LCA relocation brackets. You may not need them yet but you will once you get the car leaving harder. As for shocks I wouldn't worry too much untill you have traction problems.
Your converter sounds a little on the tight side. What does it flash to? What brand converter is it? Have you tried leaving at a lower rpm. A converter will flash to the same rpm regardless of waht you leave at. If its a little tight leaving at a lower rpm will often times make the car leave better than holding it up tight. My frinds 85 is very similar and his car leavs alot harder footbraking to 1200 than 1800 since it allows the converter to flash and get the car moving.
As justin stated also play around with the shift points some.
Let me know if you have any other questions. Let me know sometime when you are going to the track and I'll ty to make it out and help out if I can.
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Just a street driven small block with a little spray 
7.87 @ 174 on 275 radials
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