I did that to my spring perches too. Somehow I stumbled across an eBay source for the bushings, they were listed for AMC upgrades. I think I found it on another AMC forum, apparently it's sem design for other models also. No regrets on this, but the bushings have wiggled around a bit and have not stayed perfectly in place. Not a big deal, function is fine.
I have done all the ball joints, lowers are pretty scarce. Rare Parts seems to be the only hope for a manufacturer, but rumors have it they may be coming back soon. Really think about your A-Arm bushings, especially if you are doing any dirt driving. I thought mine were fine also, but they failed pretty spectacularly on a 1000 mile trip on dirt.
Getting the springs out is a bear, you really want to take out the shocks and use an AMC style compressor down through the top of the shock mount. If not, the internal style were possible but clearances were very tight.
How are your strut rod bushings? I tried some rubber ones first but they ate themselves up. Got some Prothane units and they have held up very well.
Last tip is this: If you have an oil pan leak or rear main seal leak, the easiest way to get the oil pan out is to take out the front suspension, including the cross member. Trust me, I've tried it both ways. If you have a leak, you may want to just go for it all at once.
Where are you located? And post some pictures!