I used 2.75" calipers with ceramic pads & they were adequate around town & I never needed to challenge em so I dont know how they'd be under performance conditions. The R calipers are all 2.75" & the bleeder location would likely be different on em & not sure how they interchange & reportedly (by Andy) Andy's bible covers that subject very well. If I wanted more I'd get some 11&3/4" horseshoe adapters/ 11&3/4" rotors. They take the same calipers & I'd do a bed in procedure with some performance pads

you have increased .140" (more than 1/8")
i think 1/16" is about 12% increase in volume...and leg, and will
explain the hard pedal with a lot less travel.

Bigger calipers will be here today and the pads have already arrived.

Pads are Wagner SX84/SX7017 severe duty pads.

Just an update- Swapped the calipers and pads over last night and bled the system out. Drove the car for about 1/2 hour and worked on bedding the pads in. As expected there is more pedal drop than before due to the larger pistons (2.75" vs 2.60") but the brakes seem to work better. I'm going to drive the car this weekend for a few hours and see where everything settles out. I think the current master is going to stay as with the current caliper and pad setup the pedal drop to pressure ratio if you will seems good to me.

Next step is to move to the rears and get them where they belong with 11 x 2.5" brakes again. Already have two brands of shoes on the way along with new wheel cylinders from e-berg.

Thanks to everyone who chimed in! The car is much more fun to drive with some proper brakes and not diving about.

Rock Auto strikes again!

I ordered the first set of heavy duty pads and they came in correct so I went ahead and ordered a second set to have on the shelf.... and they are generic junk pads in a generic Big A Automotive box.

sigh.