I'm a big believer in hydroboost.  I have a hydroboost unit sitting on the shelf waiting for me to have some time to start the conversion on my '67.  

I have 4-wheel disc brakes and originally manual brakes, using a 94/95 Cobra SVT MC w/a 15/16” bore, and while there was more foot pedal pressure needed, I did not find it un-reasonable.
 
I went to a hydroboost system only because I wanted to try it, and thought about our aging may require it in the future.  I changed the MC to an 95-97 Explorer MC w/1-1/16” bore.  As I had removed the shock towers, this eliminated that interference.  As I’m using a hydraulic clutch, I installed the off-set clutch MC set up by MLD.
I have some info on clutch pedals that I will email you. 

Having had hydroboost equipped vehicles for over 2 decades at this point I don't consider the system to be complicated.  I put 300k trouble free miles on the system in my '06 Diesel F250.  If you already have power steering adding hydroboost really isn't all that much additional plumbing.  

MS wrote:

69 and 70 are different in how they mount to the car.  The 70 auto and manual supports are identical except the auto version has no provision for a clutch pedal stop.  This is easily remedied by welding on a small piece. I like to make it so the stop has an elevator bolt in it so pedal static position can be adjusted.
Manual brake pedal supports have the threaded inserts for master cylinder bolts swedged in place.  The one for power brakes just has 1/2” holes where the booster studs go through.
So, in all, there are four different pedal supports used on the 70, but any of them can be converted to fit what you want.

 
Sounds like it's easier to modify my auto pedal and convert it to a manual.