Looking to fabricate my own engine mounts,have some questions.

Apparently big block 3642814 & 3642815 spool mounts will work. I have not attempted yet.

I debated modifying the k member I have, but if I ever need to go back to the small block I would have to source a k member.

I have also been looking at motor plates right now. My problem is headers. I want to retain the power steering (for wife) but I need the headers to handle 512 cubes. 2 inch primaries and power steering dont mix.