I have another question, I have read Ted's article on mounting the neoprene rear seal several times, I don't understand where this applies:
KW Copper Coat or similar type of sealer is applied to the retainer flats where it mates to the block. At this point, the remaining rear seal half is laid into the retainer groove with emphasis being put on insuring that the lip of the seal faces the inside of the engine when the retainer is bolted in place.

Do NOT use paper towels to wipe any internal parts of your engine!!! Use lint free cloths only  please!!

"FREE SAMPLE"

Oops that was me, thinking of the past. I’ve collected white lint free what look to be paper but are not from Kimberly-Clark. Those are what I use. Sorry...

56 Vic, B'Ville 200 MPH Club Member, So Cal.

Here are a couple of pictures pointing to where sealer is applied to insure that there is no oil seepage occurring at the parting line of the block and rear seal retainer.  I use K&W Copper Coat on those areas but any suitable sealer should prove to be adequate there.  The point is to not install the rear seal retainer dry or without sealer there.
     

Lorena, Texas (South of Waco)

That’s a ‘Yes’ in that the original gaskets on the spur gear pumps are typically destroyed when removing the oil pump cover for the first time.  By the same token, I’ll not use any oil pump within an engine without first disassembling it and giving it a thorough inspection.  Best Gasket does supply new gasket for the spur gear oil pumps in the rebuild gasket set but if you’ve already used that gasket on the old oil pump, you may be able to salvage that particular gasket and reuse it.  I have extras but it would require mailing to Spain which could take awhile.  If I need to mail you some gaskets, just send me your mailing address.

Lorena, Texas (South of Waco)

Thank you very much Ted, now I have everything clearer

Thank you very much again, I highly consider your offer, I think I have another gasket. It is I who will have to send you something for your help for so long. He is a great person 👍

I have already installed the crankshaft and of course the rear neoprene seal, on this I have two comments, first: the final axial play is 0.004 ", I do not know if this is sufficient or if it can be improved. Second: when introducing the black seals sides, these entered with the hand without effort and when introducing the nails to the end the seals are about 5mm lower than the cover, this is not if it is normal, fill the final hole with RTV black sealant

I have disassembled the new oil pump and the gasket has come out of a piece, I still have a new one, I am going to wash and oil and reassemble, does the gasket have some kind of sealant?

👍