You should look around the forums and see what people have to say about Otto cause he (in my opinion) is one of the best people you could possible have to build your 914 motor HANDS DOWN. Even Bruce Anderson recommends him.
He built my 73 2.0 liter motor in about a week and a half
He only used factory OE parts and gave me a 1 year guaranty on it.
He did lie to me though, he told me that I would get about 32 miles to the gallon but its MORE LIKE 42!!