Big Brakes on my Elky

[LuckyATX]

I am wanting to upgrade my braking system soon on my 70' elky. I have factory front disc brakes in the front and drums in the rear. I have a few questions in regards to the CCP big brake kits. I read the tech article where the nova big brake kit was used on the 68' Chevelle to change the offset using the nova hubs. How much does it change it? I am running 17x9 torq thrust 2's with 4" of backspace on 255/45/17's BGF G-Force T/A KDW's. I would like them to not be so close to the fender. I'm getting ready to lower it in the front by 1" and would love the extra clearance.

The #2 question is as i already have front disc's and will be using my stock spindles. I recently installed a new master cylinder, and vacuum booster. From what it looks like I can use the MCPV-1 in place of the M/C but still use my booster?

I plan on getting these items, am i forgetting anything?
6267WBKP13 1962-67, 13 inch Big Brake Kit
6872RWBKP12 1968-72 CPP's New Rear Big Brake Kit
Option36 Chrome master cylinder MCPV-1
2x Option34 Powdercoated Calipers, pr blue, red, black, silver
2x Option33 Stainless Steel Braided Brake Hose, kit
RSFLK316 Stainless Center Rear Brake Hose 3/16 adapter tee

Thanks for the advice!