since i was doing my
oil pump about four times, i got a one piece felpro Marine gasket, but it was so soft i could't get it to stick on the block, so i got a old metal sump from the wrecking yard, had the guy cut it off so i just had the flange, he used a Sawsall, then i can use it to tack the gasket up, snug it with studs, tweaking the little nibs at the front and rear so they fit into the tiny recesses, then when it drys with the tack, carefully remove the flange, and install my Aviad. It is nice to put on a gasket "from the inside", the sump cut off was only a few bucks.
Worked for me, but the most things do....