Can I lay frame with 26" tall tires, 2.5" drop spindles and porterbuilt state 1 air

[BrentRS1985]

I have a 69 c10 sb. I have already decided to purchase the extreme drop member for the rear, but I'm wondering if it would be necessary for me to spend all of this money on the front if I don't plan on running a big wheel combo. For the foreseeable future I will be running 15" wheels with 26" tall tires on the front and rear. This made me wonder just how low the truck can go with just air and 2.5" drop spindles on the front. Thanks!