Need a LA/Magnum Small Block Guru..or the like lol

The small hole in the block by the tail of your caliper is the oil feed hole to the heads. There is also one on the other bank on the rear. I have a 85' 318
that has roller lifters. as for the serial and casting numbers I will look around for an answer. It looks like a roller cam LA that came out in 85'. toolmanmike