67 Dart Idler arm question

Hi FABO
Sorry if there is an other thread on this, there are so many re idler arms and pitman arms, i got overwealmed lol

Ok i have a 67 Dart,270 with PS. and 273 eng
I have heard bad things about the idler arm for this car, and am at a point of needing to replace the idler and pitman arm, as i am replacing the steering box as well. Have a used box from a parts car i had, was a 6cyl car but basically looks the same.
My question is, whats the problem with the idler arm for this car, and what do i need to look out for when trying to buy one or locate one?
I dont want to have to make several trips to parts store cause i got the wrong one.
And second question, what is the proper way to remove the pitman arm?
Do i take entire box to machine shop and it is pressed off and back on? or can i do this with rental tool?
Never had to replace pitman arm b4, all other parts, but not the pitman.
I also currently have the engine out of car, and looks like the best way for me to remove idler arm is while eng is out. looks like it would be a serious pain in the arse to try with eng in car.. Am i wrong on this?
Thanks everyone for any help. Mopar Noob here.
Alan :prayer: