I've been looking at F1 cars too. If it is, it's several years old. New ones are way more engineered than that. Looks almost like a custom show car of some ilk.
I've found 2 pics of it in Google images but both are gone now. It has a real high wing ing the front and a higher flat wing out bck. from the 70s I think
Jochen Rindt had Firestone on his 49b in 1969 http://www.f1-facts.com/overview/person/JRindt Good job!
Based on the grill it looks like a Dodge cargo van but like most time in this thread I'm probably wrong