Brakes for the Missile-need advice

I went 12.19 all the way around with 4 piston dynalite calipers, the 6 piston set was $1600.00 just for the front

Unless you're using an adjustable proportional valve, you're setting yourself/car up for a rear dominant setting meaning you're more likely to lock up your rear brakes. To avoid that, use either an adjustable proportional valve or if you run a stock drum/drum proportional valve run bigger/larger disc up front