If it's really leaking around the windshield or backglass, there's only one ting to do. Remove the glass, put in a new rubber gasket with sealer and reinstall the glass. It's not really easy and requires two people to accomplish. You might consider having it done professionally. I've done it several times on my '66, but they're a little different than a '68. If you want to attempt it yourself, get a restoration book or two and read up on it first. Go slow and be careful. I cracked a windshield once doing this.
Rev
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'66 Coupe, 306, windage
tray, TRW flat tops, 351W
heads,pocket ported, 268
CC hydraulic cam, R tip
R's, Edelbrock Performer,
600 CFM Holley vac. secs.,
Mallory Unilite, coil, fuel
pump, Tri-Y headers, 2 1/2 "
custom pipes, 3 chamber
Flows, stock C-4, 3.25
Currie built 8" rear,
March under drive pulleys,
13.97 e.t., 100.1 mph
1/4 mi.
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