Lack of oil pressure on startups isn’t helping the issue. I would want that resolved before it goes back together. Check to make sure all pipe plugs are installed, heck pickup to bottom of pan clearance, install a magnet in a safe place, check your crank thrust clearance with your at it, what kind of oil filter?

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time