Sounds like a sweet ride!
Yes, I have the del-a-lum bushings on my Hurst/Olds too. Wow, I am also extremely impressed. Zero deflection, they'll last about forever, and you can move the control arms with one finger (when the springs weren't in) where before it took some muscle. If you're considering poly bushings, don't, get these!
Highly recommended! Even my machine shop guy I had press them in was impressed, after just seeing them he went out and bought a set for his Chevelle. Only problem is the Global West company itself--late to deliver, don't return calls, they bill your CC a month before the product ships (which is illegal), etc. I wonder if they're available through some place like Summit?