Mark the distributor and the intake.
Align the marks on each after priming and it will go right back in like it came out.
Use a cordless drill to spin the oil pump.
A tool mimicking the end of the distributor will be what you are after when priming.
I know my Fords used to hex shaped, but I think the oil pump driveshaft's top is slotted on a BBC...I think.
The blade of a long skinny straight blade screwdriver will do the job in a pinch.
Or they make tools that have a bushing and bearing to align everything correctly.
Rolling the motor over defeats the purpose.
You want to pump oil through the galleries and build pressure before rotating the crank and assembly.
Here's one at Summit:
http://www.summitracing.com/parts/sum-901010
and a shot of how the end of the tools look: