if you wanted to you could pull out the distributor and put a drill on the oil pump for a while , you just need to make a shaft that looks like the one on the bottom of the distributor to put in the drill, and turn the drill in reverse.
but if you've already been cranking it it probably pushed some oil into the journals anyway. Doubt if it is rusty inside the engine if it had a hood over it.
change the filter and oil for sure first. and again after it starts and runs for not very long.
I'd pull off the covers on the float bowls and clean them out. and when you start it make sure the float isn't stuck and overfilling or you could have a fire. you are going to want to clean the pistons in the SU's but I'd see if it runs before doing that. you could pull the air filters off , probably need new ones anyway, then lift the piston upand let it fall make sure it isn't frozen up. it should go down slowly, and you can top up the dashpot things with ATF ( black knobs on carbs)
wouldn't hurt to take the rocker cover off and douse it all with oil when you fill it.
you are going to need new brake parts and clutch parts. Use silicone stuff for the clutch if you change all the seals in master and slave.
I'd rig up one of those plastic inline filters for the gas line, so you can see if you are getting crud from the tank.
squirt some oil in the plug holes and crank it over lots, the rings might be stuck so take it easy on it for the first while.
It'll run , it's a Volvo