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What kind of car? Slicks or drag radials? I know a 28x9 slick would work on those wheels and should fit under most b-bodies

The car is a 69 road runner.The tires I have on it that ran 13.04 @ 110mph were p285/70r15 BF Goodrich Radial T/A street/all season tires.These tires are 30.7" tall.
I want to get a set of slicks for the car,but I don't really know what works best.I am GREEN when it comes to drag racing.I have an extra pair of 15x7 steelies here and thought they would be good to mount some slicks on.
I would like to have the tallest tire possible because I like the looks,and I thought that the smaller the tire in circumference,the slower the speed.That's why I did not go with a p275/60r15, which is 28 inches tall.Am I correct in this?
My goal is to have my car get into the low twelves.I can tell you my engine combo on request. What do you all suggest?

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Ok, so whats your engine combo?

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I shift it at 5,800 rpm,I tried shifting at 6,200 rpm but the car slowed down.
I purchased a set of 29.5x10.5-15 off of cl last week,but I think they are too big!(for my rims anyway)

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..my first couple of questions would be ...1-did u happen to notice what your finish line rpm was when you shifted @ 5800?..and 2- do you have any plans on changing gear ratios..?...you want your finish line rpm to be at least the same or a few hundred over your shift point(assuming your shift point is at the peak power making-rpm with your head/cam/intake combination which by your description of your combo, i would say it's real close.)if you have no plans on changing ratios you can figure out what height now, but if you think you're gonna switch you need to wait and get it back to the track with the new ratio to see where you finish line rpm is.then go from there.

as far as brand of slick i would suggest lookin at a jegs catalog. it shows all the brands and sizes, and they are right there side by side so you can compare sizes and prices.(also have special manual shift sidewall slick designation). ..i've tried just about every brand and i seem to keep goin back to hoosiers..my only complaint with them is that i only get about 70 passes out of them and then they start to go away(lose consistency).

as far as rim width, as stated earlier by Dart1031 you want the widest wheel you can get under there.. i'm currently runnin a 15x7 wheel on my '67 with a 29x9 slick and i've had no issues with stability but you're gonna have to run 14-16lbs.of air in them. i plan on trimming my inner wheel lip flush with the q/panel and use an 8 inch wheel.just haven't gotten that far yet.

hope this helps and isn't a bounch of stuff that u already new..but you said your were GREEN so i'm figuring you don't know some of it.

btw we need pics of that Bird.