I am trying to think of a reason I would choose the Urethane mounts over rubber. Are they as soft as the rubber mounts? Will they absorb the vibration any better? I would call the manufacturer of the urethane mounts and have them really sell you on them. There are certain urethane based products that will out perform the vibration damping characteristics of rubber.
I like my poly mounts. With an engine that idles very mildly like the LF7 (327/210 horse), you shouldn't notice much of a difference in vibration. I have the same motor and hardly noticed a difference other than that shifts are a bit more firm... I guess do to less torque being absorbed by bushing deflection? This causes a harder hit to the rear wheels? I also replaced the tranny mount with a poly piece.
I don' know if the poly tranny mount is my problem, but i replaced my engine mounts with stiff new rubber, everything fine. changed my old rubber tranny mount to poly, now i feel a lot more vibration. My friend put poly everything in his 68, also some vibration, but who cares? thats what musclecars are about. with your setup it shouldn't be to bad. Also the price is pretty good.
I have poly motor mounts and a stock tranny mount on my 69 with a 400 small block. I'm not a big fan of them. I am going to switch back to stock style interlocking motor mounts. There was noticeably more vibration transfer with the poly mounts.
I installed the poly motor and tranny mounts . There is definately more vibration but I don't mind it. It's not exactly a fair comparison in my case because the stock mounts, all of them, were broken/cracked. However, I would do it again.
69 RS Conv,355,M20,4.10's and I don't worry about stone chips.
I've got Energy Suspension poly mounts for both engine and tranny. I don't feel any significant vibration. Look and fit well. Stronger than rubber but that probably isn't a problem with a 327/210....but then my 327/275 with a PG had a torque strap because they used to break engine mounts.
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