road race engine...

Live a 6K for hours?

I’d use the Milodon road race pan and open up all the oiling passages starting at the oil pump. Your 6800 rpm is not suited to stock oiling passages. You should consider 6500 as a max though some blocks will oil better than others. Don’t gamble! Treat it like there is an issue at 5500 rpm and address it from there and make it right.

I wouldn’t reuse the stock rods unless they were perfect coming out of the block. New lighter and stronger rods are cheaper than fixing OE rods.

While I get the quip of the Summit racing employees bonus, that is actually your very last concern that should not even come up on your death bed many years from now. Do it right, do it once or pay twice in doing it over again.