cowl vent- remove or leave it?

[LOW A D]

Just wondering how many are leaving the cowl vent on your trucks? On my very first hotrod, about 25 years ago, I left the cowl vent and found it to be great for ventilation, however, it always leaked water. Since then I have welded up the cowl vent on every truck I built and put in A/C. On the truck I am building now I want to leave the vent and not run A/C. My question is for the ones using the stock cowl vents, do they leak water? are you using the stock lever to open and close or going to an electric setup? Thanks, Greg