Howdy,
Looking ahead to starting up the 327 in my 57 after building up from the short-block (non-roller). It has sat a while, so I have done the Marvel Mystery Oil in the cylinders routine, rotated, repeated, primed the engine using a drill driving the oil pump, rotating the engine as I went (got oil to all the rockers). I figure to prime the engine one more time (rotating again), and then button it all up.

How long do you figure I can let it sit before startup (so I don't have to prime again)?

I have read some startup procedures where after the initial 30 minute break-in, you then drive the car for 30 miles at varying speeds. Is the driving part necessary, since I am not sure the car is road-ready yet? If I need to drive it soon, I will have to do some more work first.
Thanks, Doug