Yeah 'bump stop' is all I have ever called it, although it is pretty much irrelevant to the purpose it actually serves.
Support Rubbers are more appropriate. I can understand what you mean about retaining suspension movement and I'm glad to hear it isn't going to affect anything in a negative manner.
The engine is obviously too much for what I need but my options are pretty limited at the moment as the A10 in the car needs a rebuild. [It still runs superb but she puffs a good plume when she's been idling and suddenly cops a foot to the accelerator, then there is a little knock which is pretty concerning]. Plus I've spent all this effort on the rip snorter, might as well see how she goes.
Here is a picture of the piece in concern. I forgot to mention the removal of the radius rod [is that the correct term?] as well, this enables the LCA to drop a little further and thus allowing easier access to the support rubber.