I would try Torko leaded, it's good stuff and I would stay far away from Toluene as a single fuel additive.
I don't profess to be a chemist, however you cant buy pure Toluene,it's strictly regulated .
The hardware store grade Toluene is full of distillation by products .
Just adding Toluene may be a decent additive if all you want to do is protect your engine from detonation.
But you will also suffer sloppy throttle response and your engine will run poorly especially in the higher rpm range.