Front end rebuild parts Interchangable ?

I have a 1965 dodge dart originally a slant6 suspension car . im upgrading the suspension to disc brake parts from 73-76 abody cars. I'am using my 65 lower control arms and 74 duster spindles calipers and 11" rotors and 74 factory upper control arms. I always use parts made for my year of car but noticed front suspension parts are getting harder to find like the pitman arm? Can i use 67-74 pitman arm?? The only pitman arm for my dart i've seen brand new is by a movtech and doorman? Im worried that there built cheap and only last maybe a ywar or two? This dart will be a daily driver and i want parts that last. Is the 67-74 pitman armis a different geometry? I'm up grading to a v8 and will be using a V8 drag link instead of the slant 6 drag link. What do you think or any questions? Let me know thanks