Yes, I did the installation. Yes they are tough to remove the old ones. It's a combination of pressing them out and drilling them out. You need a press and a drill press. Installation of the polly's are really easy.
Yes you should pup in zerk fittings, and yes they should be greased (with synthetic) when you assemble, and yes they are worthwhile to install.
Get them from Hall or Pantera Performance.
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