ok you should be fine. two things. your doing it with cab off. so once you put the cab back on the peddle rod will not retract that far back and will cause the rod to be more level. Most importantly you will want to adjust the push rod after you get setup so not to have preload on the master otherwise your going to burn up some brakes.
Number 2. if you notice in your picture a small hole on top of frame about 8 to 10 inches back from mount. That is technically your stock position for the stock spring. which gives it a better angle from where you have it now. but looks like the spring that came with that setup is two short and your may be ok where it is. As long as it pulls it back nice and smooth and tight to brake light switch you should be good to go.
