Youtube user Drag Boss Garage has some vintage Pro Stock tunnel ram info on there. You can see how the old school pro stock racers were modifying the plenum size down smaller and messing with the runner angles on those old cast aluminum tunnel rams bitd.

He is a Ford guy so it's almost all Ford engines, but the theory of what Bob Glidden and those guys were trying to do to make those work better should apply to any race engine.

EDIT:

Here is one of those videos. There is another one he has that also shows how they cut the runners and reworked the intake angles.

https://youtu.be/toBKoPEW0BU?si=PcINUr31R3F-LxDP