Yes put oil in the bores not WD40, but take rocker cover off and spray the tops of the valves (inside the springs) with WD40. Leave cover off until you crank it. Leave the plugs out.
Undo the oil feed pipe off the block and fill the block hole with oil.
Then leave it all overnight so the oil soaks down around the rings and into the oil pump.
When you crank it over next day leave the banjo pipe bolt slightly loose until you see oil squirt out, otherwise you can get an air lock in there.
If no oil pressure, refill the block hole again, roll it backwards in 4th gear a turn or 2 and fill again.
IF NO OIL PRESSURE CAN BE GOT AFTER 3O SECS OR SO THE STRAINER GAUZE IN THE BOX IS PROBABLY BLOCKED, DON'T TRY ANY MORE- JUST STRIP IT ALL.
My 77 Moke had this problem, it had been parked for ages with no oil in it.
Make sure all the valves go up and down fully, my 998 matic was parked 10 years and #4 exhaust was a bit recalcitrant- gentle persuasion with SFH freed it up OK, then it ran for years.
Good luck, nothing like the sound of a motor starting up that's been dormant for years.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
