Re: BB Oil pan, steering cross shaft contact???
Is your ZL-1 still a two piece block? Or is it a more modern cast aluminum version of the GEN VI one piece rear main seal block?
That would be the first question.
Following that you will need an oil pan to fit a CAR body (Camaro, Nova, Chevelle or Impala). Whether it is a Mark IV block or a Gen VI block.
A Corvette and a light weight truck have their own proprietary oil pan that will not fit a car body.
Most all crate engines sold by GMPP are sold with a light truck oil pan because the BBC was only found in light trucks after 1974. If they were to sell a BBC to retrofit a car that never had a BBC from the factory they would face issues with emission laws. But by selling a light truck replacement motor, they can shrudge their shoulders and say "who knew they would put one in a car?"