I believe a 28 would have a four cylinder motor and a 29 up would have a six. If you can't get your answers here, the folks on the VCCA site can tell you about every detail including the numbers. I am not sure the rims on your truck are the ones that some consider dangerous. I think the more modern multi piece rims are the ones to worry about.
I wouldn't sandblast any sheet metal because it can be warped. I also have not heard about the frame needing special paint.
It sounds like you have a wonderful piece of history there, congratulations. I can't wait to see the photos!
