1964 Corvette question

[bodom22]

I was hoping some one could give me an idea of the value of a 1964 corvette I'm looking at buying. The prices seem to be all over the place for these cars. I just want to make sure I don't get ripped off.

-perfect paint and interior (red/red)
-convertible both tops perfect
-non matching 327/365 Hp motor from a 69 vette (original 327 car)
-4 speed original

Let me know if there something else I forgot to mention that may affect the value.

Thanks