i have a new GM 350 block that i bought from Scoggin Dickey, they said it came completely bare and i should order the oil plug and freeze plug etc. that all come in a little kit so i did and when i got the block i noticed freeze plugs already in it, where do all of the other plugs go? any diagrams/ pics? do i need them all? or do the blocks come with them all installed and i was ripped off for $15? thanks