1970 cuda gran coupe??

So thursday I am going to look at a 70 cuda gran coupe. The guy tells me it has a factory 318 in it. It will need some work to it, but should run. What do these cars go for? Low end? and high in fully restored? What are the trouble spots I should be on the look out for? This car is supposed to be in Ice Metallic blue? No photos yet and I know that makes it hard to give a value on. I am just trying to keep myself from being totally upside down in this car if I buy it. If it has a bigger engine in it? I know it is not a hemi, but still can be fun and nice. Thoughts? Opinions?