If you rebuilt it ,it should have oil on the rings and lube on bearings already.But it still wouldn't hurt to spray fogging oil in the cyl's and turn it over anyway.Light{30wt) oil would work also.Keep it covered with a sheet or cloth tarp.Don't use plastic as moistre can form under the plastic.
When you finish it up in spring just prime the oil systym-use a drill with a screwdriver or old dist shaft in the dist drive,install dist, fire it up.It'll smoke for a bit till the oil burn's off but it'll be ok.Tom