duster bushings question

need some advise on my bushings on a 73 duster. car is strictly a street driven cruiser, no racing or whatever.how do i know if my rubber bushings are really wasted? after a visual inspect--not on a lift--the ones i can see look dry with some cracking. sway bar ones do not look bad, any way, sould i go to poly or moog rubber if they are bad? seems to be different opinons. car is driven a few times a week during the summer. i don,t have the time or experince to do these.what do you think this would cost? i know the parts are not bad but with labor at 90 an hour , just wondering. again how do i know they are wasted for sure ? thanks