Small block windage tray bolts

On a street engine, you might be better off leaving it off, there are some bolts out there, but they are like hens' teeth today.
The E58 360 police and taxi engines had a windage tray in them, keep a look out for one of those as a source.

I eventually went with the ARP stud kit, but that is a whole different problem because you need to line hone or line bore the block if you go to studs.