90 degree oil filter gaskets and bolts questions

Over the years I have used many without leaks. 1st on was on a 1972 Ralley 340 car. But all the bolts had large heads and mutable round holes like the ones currently sold now.
The bolt I have now is 2 long slots (pictured see funny bolt 2 long slots) and smaller head.
I wonder about flow look like both would flow? Would it flow as good as the round hole bolts?
I did port and blend my oil pump, as well as the oil filter adapter. Are the Mopar Gaskets shown still good at sealing or should I use another brand?

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