Need help with 6 lug wheels

[FL71C10]

I have a 68 c10, and I am planning to do a disc brake conversion with six lug rotors. I am assuming my original wheels wont fit over the rotors so I will need to get some new wheels. I found a set of 6 lug rally wheels, and I am hoping someone can help me decide if they will fit the disc brake conversion rotors, which I haven't bought yet.

Here are some pictures of the wheels. I am guessing they are off a late 80's or '90 ish blazer. if so, it should work fine, right?

Here are the rotors I am planning to get.

https://www.summitracing.com/parts/clp-cp4r-6