My vote is for from the top. Make sure you have a couple of buddies to help wrestle the engine and trans into place. Protect the fender tops and cowl with heavy blankets, and wrap and tape the output end of the trans with a towel. Don't put any pulleys on the front balancer, because they will snag the rad support. It also helps to get the front end of the car down as low as possible. Make sure that you have the boom of the engine hoist out far enough to get the powertrain in place without running the rear upright of the hoist into your grill. Not much is worse than having to take the whole shebang out again to set it down and move the boom out a notch. Don't ask me how I know.
My friend Richard, and myself helped another friend, Earl drop his Hemi, automatic back into his freshly painted 1970 Charger R/T SE . He was really nervous about it, as some other guy's had said to do it from the bottom. Richard and I assured him we had both done a lot of engine installs over the years, and we could get it in without a scratch. We let the air out of his front tires, laid out the blankets, and had it down in place and bolted up in about 1/2 an hour. Usually the hardest and most tense part is getting the hood back on and adjusted with no scratches.
