im sorry i have to step in here and offer my opinion. The guy is brand new to datsun and he may not be up for the 350 swap right away. I also dont believe that 350's are all that great that most of the people here claim they are. But also keep in mind i have been in a 350sb Z a few times and woooooooweeeeeee! NICE!
I stand by what i say here. the best bang for your buck has got to be the turbo L28. whatcha gonna spend on something like that? Id say about $400 tops for the engine running if you look around and get a proper deal. The engine drops right in and still uses the stock mounts for everything engine and tranny. i dont see how much easier it can get than that. on a scale from 1-10, 10 being the most difficult, the turbo engine would be a 1 on my scale.
Ask tony fruzza and other turbo L28 guys and im sure they will also agree with me. When that boost kicks in, goodbye mr V8.