Stoddard Solvent is what most garages used to use back in the days. Because of the ingredients it was removed for use as a cleaning solvent. We used to put some ATF in it when we first changed it out for some new because it burned the back of your hands.I am a participant in a study of the long term effects of this product for life. Testing on me is done every 5 years now. It used to be every year but as I got older and didn't die from it, they only call me in every 5 years now. They suspect that the minor "heart block" I have may have been caused from my contact with this solvent.
I would highly recommend that you weld on some fold-out,out-riggers on your engine test stand so the whole thing doesn't tip over when you "goose" the throttle a few times. Don't ask me how I know these things.
If you need the little piece of a VW bell housing to mount your starter up on the flywheel, let me know, I'll ship you one for the postage.............Bruce