572 oil system with A body Hemi K frame & mounts

I have a megablock and building a 572....
I am now leaning towards a factory appearing deal. Just bought a K frame, mounts and spacers. I’m pretty sure internal pickup is out, so was wondering what oil system and pan I can use without cutting up this K frame and left motor mount bracket ? ..... or should I ditch the 4.5 crank and put in a 4.375 - 557ci internal pickup ????
What are you guys using ? Thanks