best resale green 318 or blue slant

Which is a more desireable car?

A blue slant six car, or a green 318 car?

Lets assume both need minor lower quarter work a paint job, and front seats recovered.

Now lets assume a good 318 can be had to put in either car.

Would you buy a blue C code car with a 318 over a green G code car?

Or does factory v8 trump B5?

What if the C code car was factory green, but is now blue, and well done?