I thought I wouldnt post in here, because Im still under the impression that nothings going to happen with this anymore no matter how many time people keep bumping this thread with "Ill only believe it when its in the scrapper" posts, but if it does continue, I would would hate to see all this work for naught. Id hate to see some ridiculous engine set in the rear of the car or stupid golf kart engine.
I understand height is an issue, but it would be nice that even after all this work you can keep it Nissan/Datsun. Just make a dry sump A15 engine and run that. If need be, raise the trans tunnel a few inches for the driveshaft.
After all this work, it would be nice to keep it as Datsun as possible as you wanted to drive a slammed 510 and not a some ridiculous hybrid vehicle made of rusty sheet metal.