Help with disc brake converison questions

[tr4boy]

Listers,

I'm going to convert my wife's 1954 GMC 100 to discs. I have some decisions to make and wanted some input.

I'm looking at the performance online kits. Any cautions? Good company to deal with? quality stuff?

I was thinking of doing only the fronts, but since it's my wife's truck I wonder if I should do the backs as well. Aside from peace of mind, is there really any advantage? She doesn't haul heavy stuff.

The POL kits use 11 inch Camaro rotors. Will those interfere with the stock 15" wheels? if so, how big do I have to go?

the kits will push the wheels out by 3/8". Do I have to adjust backspacing to compensate?

I have a power brake set up now. Can I use my current MC? Do I have to add a proportioning valve?

Thanks!
Greg