I tried solid mounts and didn't like them. Took them out and sold them to @yellow rose Just to much vibration. I went with Poly Loc's, no problems so far. My 69 Dart has a mild 360 with A/C, P/S, 727 .
give it a few years , they will deteriorate and come apart , i thought they were great as well until i read a thread here and checked my poly mounts they were shot and it was not oil leaking on them no oil leaks on my car