I will be using vintage air..Has anybody ever closed up the Cowl Vents?
I have put some thought into deleting the cowl vent. My ultimate goal is serviceable cabin air filter(s). Fabricating well insulated duct from cowl to somewhere near the headlight house would mean redesigning the top of the inner fender(s).
In another thread it was suggested that the air supply might be routed through the ends of the cowl ( where the drains are ).
Good luck with your project.