Brakes going soft after raising car?

Really I'm not quite sure. I haven't bled it in a while a the brakes are holding up nicely for the past couple of months, granted I haven't been driving it much. I did however buy all new calipers, pads, master cylinder and little parts to replace all that stuff.

I got some new aluminum heads and figure I may redo the entire brake system with rear disc's when I have a new motor built for the car.
I’m in a similar situation. Ive bled my brakes twice now and the pedal still isn’t very good. Now, I have 13” cobra brakes on the front so a different designed caliper than you have but similar symptoms. I think I might order a Motive pressure bleeder and bleed it that way.