Vacuum Booster or Not?

I had a 15/16" bore, disk brake style master cyl on a 74 Dodge power wagon w/single piston disk on the front and it worked fine for me. The truck originally had a booster on it which I took off because it leaked. The master cyl had the recess for the push rod retainer so with the right pushrod it was good to go.
My daily driver 72 dart has a 1 1/16" master cyl in it and the pedal is a little on the stiff side to push but I dont mind it, if I had to change it I would definatly go with a small bore master cyl. I've never had a car with multi piston calipers on it so I dont know how much of a piston volume difference there is between the two different styles if any, but it doesn't take much fluid to compress the caliper when the brakes are applied. The rear brake adjustment shoud be kept up regardless of whatever style brakes the car has because this effects the pedal free travel.