I am looking for some help in figuring out the value of a motor. It is a 1991 502 Mag Mark IV. It is the bowtie block. It has zero hours on new rings, bearings, lifters, valves, valve seals, valve springs. This motor will be sold drop in ready including stainless headers. It also has a almost brand new drive coupler as well. It is all original, and came from a 91 Fountain Fever. It does have a new mercury racing brass water pump as well. If you guys could help me with the value of this thing I would be greatly appreciate it.