Here's a bunch more...
https://www.jalopyjournal.com/forum/threads/the-scrambler-1960-gmc-302-12-port-nitro-fed.737695/
EDIT: It looks to me as though your intake and exhaust ports should come out of the black part of the engine you've built, and perhaps you might fiddle with the proportions some.
Right now, your exhaust pipes are coming out of what should actually be the top of the block.