Well, I got a hold of a couple other oil pump so I went on to identify those and decided to take a couple picture if it can help others here.
So there you have it : Bluetop pump - redtop/20v pump - 7A pump
From the front, apart from the fact that the FE engine has a different line for the timing belt cover, nothing can differentiate the other 2 pumps apart.
Now it's easier to differentiate the bluetop pumps, the back cover is very different... the 7A and redtop rear cover is interchangeable (I mixed them up because one was in worst condition than the other, you just need to check the rotor gap)
And this is why : the bluetop pump has a square tooth design that is known to be inferior and tend to crack because of the crank's harmonics at high RPM, the redtop and 7A pumps have the same sinus wave design
And a close up reveal that they are both the same dia and number of waves...
But the red top rotor is wider, providing extra flow for the piston squirter (bluetop pump has the same thickness as the 7A pump)
So there you have it. I decided to clean the redtop and store it for the future... since I'm gutting the pump and using only the housing for the pressure release and the front seal, might as well "scrap" the least desirable pump so I used the bluetop one...
Here are the modifications :
Plug with under 0.003" interference, I dump a couple drops of red lock tight on top and presurized the inside for it to move down if their was a crack or something... now it's really oil tight
And just to be sure that the plug doesn't go flying at 70+ psi of pressure, I made it a little too long so it won't get past the inner lip of the stock pump rotor so even if it moves down it will not move out of the hole... and I drilled and taped a hole in the side with a little bolt red locktighted in just for good measure
And there you have it, anaerobic sealer is curing and I'll wash it well before bolting it in front of the tom-age
And in other news, my crank pulley is getting balanced but my machinist didn't have to tooling to overbore my rod small end so I either find someone else who can or try it myself... although I don't think my redneck machining with a press drill process is good enough for piston wrist pin soooo....