Front Disk Brake conversion

[JadeEmperor]

Wanting to convert my front setup to disk brakes with dropped spindles on my 70.

Was looking at McGaughy's or GMCPauls (I think from what I've heard here is that Paul's is McGaughy's and Paul's a good guy too).

Couple of questions though:
1) In the description of Paul's web, is states that this kit "Will not works with some stock drum brake rims" Any ideas as to what rims these are refering to. I don't have stocks (no sure what is) but I do have some Ralleys I got from Wheel Vintiques, that I painted.
2) I have a factory power booster. I noticed that a lot of people sell and install these kits with new boosters. Even the tech articles I've read in mags do new boosters. Am I okay with just the kit and a proportioning valve? Do they just do the new booster for the size, they look smaller?

Thanks