With the 45 DCOE I understand that the progression drilling holes varied 
between certain models of DCOE.  I doubt that this was a particular 'big deal' 
because after a while, as far as I know, all the aftermarket DCOEs had the same 
progression drilling.
I think it was Southern Carburettors in the UK who a few years ago had a 
specific DCOE made with specific progression drillings.
Probably an engine using a pair or a set of triple DCOEs might be more 
sensitive to the progression drillings than an A series.
Regards
Daniel1312
In a message dated 15/05/07 11:12:52 GMT Daylight Time, shelden3@pldi.net 
writes:
> .  Same DCOE 45 body can work on a Midget or
> Ferrari, all depends on the internals.  If i'm wrong in this I'm sure
> someone will correct but that has been my understanding.
 
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