Suspension upgrade Qs for '65 coupe

[bmxmon]

I have the 620 springs, they are pretty nice not too stiff of a ride. I believe my ride height either stayed the same or even went up, just because the old springs had 40 years of wear on them. Something you need to consider. I thought i've heard that poly bushings were better, since they dont crack as easily as rubber, though i could be wrong.
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I also recommend that you get a coil compressor that goes inside the spring, as its a PITA with the ones that go on the outside. Thats my regret when i did mine.