I'm ordering a new engine this week, but one little wrench in the
works.

Upon pulling my engine last night (my first solo engine-pull) and counting
flywheel teeth (110) I am now pretty sure that I have a 6v starter.

The conversion books I read stated that I need a 12v starter, and I must
enlarge the bell housing 1/10".  What the books don't say is WHERE the bell 
housing must be enlarged. Anyone done this before?

A local mechanic suggested taking a scrap shortblock, attaching the air drill 
to the crank, and using that to grind the bell housing, finishing with a hand 
file or drill with appropriate attachment.  Dunno 'bout that.

The bus is a '66.

Thanks for any help,
...Markus
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'66 "rough looker, hackjob skylit" Westy aka "The Tardis"  
                        (british racing green/white)
'74  Thing              (pumpkin orange) 
'78  Bug 'vert          (black, white top)