I would just weld/braze the advance slot so there is less travel, in a pinch I have used a piece of rubber hose & put it in the one side of the slot.
Stiffer springs, maybe, if you are detonating & need to limit the advance, but, I would not go that way.
Wise choice on the intercooler, they are very affordable including the piping.
On a draw through, the gas does some sort of cooling, but not like an intercooler. It's still going to make the intake manifold hot, pressurized air is pretty hot.
The higher the boost, the hotter the manifold.
MBHD
