Water leaking into the cab

[qytum]

Hey all,

I picked up a 66 c10 a few months back and am starting to get around to working on it.

I have having a problem with water entering the cab during rain. I can see it dripping down the passenger side starting at the bottom of the dash and going down the kickpanel.

Doing some reading around here I am seeing a lot about the roof drip rail leaking. If that were the case, would it cause the water to come in right at the bottom of the dash?

Also had a question regarding the weight of the bed. Is this something that a single person could possibly hook a hoist too and move it back a foot for painting and then set back in place?