looks like the collector that came with the 510 engine is different from the 521 one that was in the truck.
I got the 521 oil pan the other day from a member (on Facebook) out of California. So now I just need the pick up tube or I need to see if I can modify the 510 one to work.
There is a local guy in AZ selling a whole engine out of his 521, or course right after I went and bought one.