Yup, Peterbilt 377. I've always liked those. It would be great to see somone build one. If you can't really find blueprints, sometimes the next best thing is to buy a plastic model of it. Pretty sure you can still get kits of the 377 from Italeri. Actually, here is one I found. Take measurements of the model, scale them up, and it will get you close.
http://www3.towerhobbies.com/cgi-bin...?&I=LXR310&P=7