I’ve done it both ways a few times now, but believe putting the engine and transmission in as unit is easiest. I can imagine that just a small difference in the geometry of one hoist/leveler setup vs. another could make an annoyingly big difference, but here’s what worked well for me: Jack up the rear of the car and set it on jack stands (lowest level, about 12in from the floor to the top of the stand. Make sure you leave enough room in front of the Z for the full length of the engine+transmission hanging from the hoist. Aside: My son and I (mostly my son) devised this approach to minimize the vertical clearance needed (my garage ceiling is 10ft) while leaving room under the car to finagle the transmission crossmember into place. It works perfectly. Put some folded towels over the core support and draped in front of the firewall from the cowl. Lubricate the screw threads on your engine leveler. Raise the engine+trans until the transmission clears the core support, then wheel it over the engine bay, centering it right-left as best you can. Using your leveler start tilting the whole thing back (transmission down) and raising the whole thing up so that the oil pan clears the core support. Between you and your helper, one keeps a hand on the tail of the transmission and steers the whole thing, the other guy manages the hoist (up/down, forward/back, tilt/level). Hoist man should be confident in his ability to lower the hoist at a slow rate and stop its decent - practice before this point can’t hurt. As the oil pan crosses the core support you will probably approach the backward-tilting limit of your hoist. As you lower it into the bay, start tilting it forward (transmission). Continue lowering, pushing, and tilting until the the engine is almost resting on the drivers side mount (it’s higher than the other one). Make sue the fore/aft tilt looks good compared to the engine brackets and mounts. At this point, it may be useful to loosen the engine brackets bit to make threading the bolts into the engine mounts easier. Put the bolts on the driver side first, then lower the engine a bit more so you can get the bolts on the passenger side. Getting all four transmission mount bolts threaded can be one of the most fiddly, annoying, swear-inducing things you can do on a Z (at least, on mine), but you WILL get them. Having your helper push tail piece of the transmission forward/back, in/out, up/down from under the Z can help. Once the front engine mount bolts are finger-tight, the transmission crossmember can be installed. Sent from my iPad using Tapatalk Pro