Drum to Disc with cpp spindle

[MIKECHEVY69]

i have a 69 chevy c10 and i bought a disc brake conversion off ebay it was a mcgaughy kit but it didnt come with a spindle or brake booster/master cylinder. I was wondering if this booster/master cylinder off ebay would work good??? Also if i could use a cpp spindle 2.5 inch drop with my mcgaughy kit???

http://www.ebay.com/itm/321205648715

http://www.ebay.com/itm/380851856719

I also got 20x8.5 rims akuza oj rims with 245/40/20 tires for up front will they rub or will i have to do any modification to make them clear? i put the rim on and it looks like it might hit the front shocks when i turn them fully. any help is really appreciated thanks