How Do You Mount Caliper On Front? Or Back?

i've installed disc brakes on a 1972 dodge dart. using parts from a 1975 dodge dart. mounted the caliper on back side, the brakes wont
bleed ,pedal goes to floor.the caliper bleeder is now about middle ways
should the caliper been mounted on front side ? and if so would this locate bleeder valve at top? any sugestions would be greatly appreciated

I mounted mine on the back too, they work fine after I bled them. Here's how to do it. Pull the caliper off the rotor, leave the brake line attached. Get a large C clamp and clamp the piston in the bore..you don't want it to pop out when you bleed them. Now with the bleeders at the top crack the bleeders and bleed normally. When you get no more air re-install the caliper and repeat on the other side. I have a big sway bar and mounted mine that way for clearance.