Upper lower rear control arms

[joepenoso]

rear upper lower control arms

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I've got a chevy 10 bolt in my 442 with U shaped upper lower control arms and no sway bar.
I'm considering making changes but am bot sure to go with stock boxed/rubber bushing mounted arms or something like this
http://www.ebay.ca/itm/271293378881?...T&_trksid=p398 4.m1423.l2649
it seems to have plastic bushings ................what up with that?
The rubber ones last a long time and are quiet..........plastic I'm not so sure.
Any experiences with rear control arm bushings is welcome
Thanks
joepenoso