'68 Barracuda Notch

it is likely windshield seal. also try blowing out the cowl with compressed and inside vents as they get air from the cowl. another area is the wiper seals.

if I were you and since you already have working body parts, tail lights, etc. I would get on the stuff that needs attention like the above water problem. then wait and hop on the other stuff you want as it appears for sale you will generally get it at better prices.