It is actually not too bad and pretty darn close. Keep in mind that this body will do a 69 and a 70 body and after all, they are funny car bodies. Not exactly the most accurate things around. The CR M/T bodies are more geared towards the M/T cars and they do differ a bit from the Gas Rhonda bodies.
You can also soak the parts in Westley's Bleche Wite whitewall cleaner. I am sure there are more things to use, but, that works pretty darn good for removing any mold release. Please keep us posted on this build. I have a few of Mark's engines and I should be building a stalled project soon with one!!