Personally having run both on daily drivers I would put a mechanical pump on it and forget about it. Until the mechanical runs out of the capacity to supply enough fuel to the engine due to engine modifications it's not worth the trouble.
In my experience aftermarket pumps are not able to provide long term service. They generally are lucky to go more than 30k miles.
As always my opinion and $10 will get you a steaming hot cup of Joe just about anywhere.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread
http://67-72chevytrucks.com/vboard/s...d.php?t=698377