"Winston, instead of going the
"Winston, instead of going the cost and bother of completely removing the oil pump(s) and putting on plates. You could leave them in place and disconnect them.
You can simply connect the inlet and outlet on the oil pump with a small piece of tube (which will keep the cooties out and let the oil pump run along doing basically nothing) and then either remove the Y connection all together (that feeds the oil to the fuel line) or simply plug it off and run mixed gas.
I would fill the connecting tube with oil just to keep the pump itself lubed. Then if the drive gear failed or the pump stopped pumping, you would never even know (or care).
The pump sitting on the engine (disconnected)will not affect anything...
Here's a diagram of the pump - so just a tube inlet to outlet bypasses the whole oil system...
Additionally, should you decide to sell the engines in future, all the parts are there should the new owner wish to restore the oil injection.
A "professional" is someone who gets paid for their work - it doesn't necessarily mean they are good at it :)