Hey BeerBoy,
I'm not a suspension expert, but if the existing bushings are dry and cracking, you are probably looking at the original rubber bushings, which would mean they are about 42 years old and should be replaced. Rubber bushings should be fine and are a little less expensive for the parts. Labor costs shouldn't be any different, but you may get a little tighter ride with the poly bushings (that just seems to be a matter of preference). I've heard some people complain about squeaking with the poly bushings, but it doesn't sound like it's a really big issue. Most of the old A Bodies squeak a little anyway. You may end up with a mix of rubber and poly depending on what's available in the kit, but I would recommend just going with the least expensive kit if this is just a daily driver and you're not planning on track racing. I think a good suspension shop should be able to complete a front-end rebuild within a day (or less) assuming they have all of the parts available. Front-end work does take a little expertise and some special tooling and/or creative know-how, but it's not an insurmountable task and could be done by anyone willing to take on a little challenge. However, you probably won't get it done in a day if you take it on yourself. But with a couple weekends and a few cases of beer, you should be able to do it yourself (but you'll wish you had paid someone else to do it ;-)). Again, I'm not an expert, just another A body guy with an opinion.
Good Luck,
