For engine assembly lube I use Lubri-Plate, only place I've seen it around here is at NAPA.... I do this as per a retired aircraft mechanic (cousin also).....That's all they ever used on both piston and jet engines when putting them together..(United States Airforce and Delta Airlines)..He's built hundreds of auto/truck engine in the last 47 years......
for the cylinder walls, I use a light coat of 30wt engine
oil and the same on the rings.....all bearings and
oil pump get Lubri-Plate....it's a white grease about the same as your wife's hand cream......
You can probably do two or three engines with one tube and it's not expensive.....
I agree with Clois, check everything not once, not twice, but three times....One other thing I do is mark every bolt/nut when I torque them... I use red finger nail polish from my daughter, just a small dab on the bolt or nut and you know it has been tightened or torqued...........
Clois; after the dyno session, I would pull the spark plugs and give each cylinder a shot or two of WD-40 before setting up the motor and then turn in over by hand a couple of times and then store it, should protect the cylinder walls and rings for quite a while...also, say, once every couple of weeks turn the motor over by hand a few revolutions, keeps things from sticking and keeps a little lube on everything.....
David