First of Vixen let me do what other have not done......Welcome to you and your husband Greg to the Datsun 1200 site.

It appears to me from the onset that you and Greg are very knowledgeable about Datsun motor's more specifically the a-series motor, please don't let some of the comments posted by other members put you of participating in future posts. I have to admit though that you have introduced yourself with a pretty bold statement......200hp from a n/a a-series is a tall order, not impossible I admit.
Maybe if you filled in some of the gaps and shared with us the accessories ie carburation, ignition and type of computer it might keep some of the wolves at bay.....so to speak.