Help: Value of a 914-6 core motor? Options

[RSWannabe]

I could use a little help here. I'm relatively new to the 914 world, but am a long time Porsche 911 guy. I have a 1970 914-6 which is missing its original motor. I'm looking to find a factory 914-6 motor to put in my car and have come across a 1970 914-6 long block in parts a guy is willing to sell me. I know how I would value this if it were just a 1969 911T parts motor (911 equivalent of a 914-6 motor), but not sure what the extra rarity does to the valuation. It is missing intake and exhaust and a few of the original cylinders were damaged, so it also comes with a set of 2.2 pistons, cylinders, and heads (unknown if T, E, or S at this time). So what we are talking about here is a factory 914-6 case with a serial number in the vicinity of my car (judging only by sequentiality as I do not have a COA on my car yet) with some associated parts of unknown condition. If this were a '69 911 T case and the same parts I'd say its worth about $500. What does the 914-6 factor do to the equation. Your thoughts and input would be appreciated.

Brooke