Which route to go as far as my build

[HEADTURNINGC10]

I have a 69' c10, building a radical street truck with a large cam high compression, disc brakes front but no power brakes or steering. Looking for some advice on which route to go as far as tire sizes either 15 or 18s. I am looking at mickey thomspon sportsman s/r tires 29x15 back maybe 28x10, 28x8 or 26x8. Also one more thing i have a 85 frame lowered 4/6 i was told the front cross member will bolt straight up so i will have the disc setup instead of the stock drums. I havent looked to much at the frame itself but after talking to a couple groups they say it will work. If yall have anything to add or opinions this is my first build. I plan on embarring some mustangs. Oh last thing i plan keeping the stock rear suspension as far as design with the coil springs and trailing arms but i hope to add sway bars and additional suspension helpers.

New to this. 1969 c10 short bed stepside, 350/ turbo 350
-racetruck