Save yourself the aggravation and take the uppers and lowers to a parts store that will replace the bushings.
I replaced my own in my stock car and it was a PIA. When I did the front suspension on my 67, I took the new bushings and the suspension parts to the local parts store and had them replace it. Yeah, you pay them labor, but IMO it was worth it.
If you do go this route, don't piant them before you drop them off. They'll mess them up.
67 Camaro (Almost done!)
76 Trans Am Stock Car
68 Dodge D-100 P/U