Going of memory here, but I believe a 289 / 302 with aluminum block & heads comes in around 400lb - I am using 500lb for my preliminary W&B calculations to account for accessories, prop, etc.
Interesting. I would have thought it was a lot more than that but then again my only experience with one has been looking at it when it was in the front end of a vehicle.. Then again, I'm kind of weird in that I don't even change the oil in our car and have little interest in automotive mechanics, but I have a great desire to build an airplane. Go figure.....