Which wheels do I need?

[oneoldtruckguy]

I purchased a 40 ford coupe sitting in a field since 1954 and someone stole the wheels off it years ago. I need to get some wheels and tires on it to move it. I think I found some originals but not sure of the size yet because the guy is a a swap meet in Canada. Should they be 16"? If so I am worried about finding 16" used tires. What do you recommend for the cheapest and easiest way go?