If you have a old dist laying around that your not using you can remove the guts and clamp directly onto the shaft with a 1/2 inch drill or you can use a deep-well thinwall 5/16 socket with a long extension and a speed handle but I doubt you'll turn it over fast enough to properly pre-lube the entire motor, best bet would be to clamp the extension to a drill.
NOTE: direction of rotation on a SBF is "counter clock wise".
There seems to be alot of confusion about the firing orders in SBF's so I added this...
The Firing order for all 5.0HO's (high-output), 351W's and most all aftermarket cams used in 302's and 351w's are as follows:
1-3-7-2-6-5-4-8
If your looking at the front of the motor number one on the dist should be about at the 12 o'clock position.
Hope this helps> Cp