1973 dart sport brake booster

Okay I think this might be the one I need. I have a 360, should I sized up to the 8 inch booster?I have front discs and rear drums. I also would still like to be able to take off my valve cover without taking the booster off..

I also have discs/drums combo, but not a V8 and I don't know if a 8" booster will block your valve cover.
Surely not. Original Midland-Ross boosters are 7 1/2" and they leave enough clearance for the SB valve cover.