Newbie has motor identification question

I just bought a 1966 Valiant. It has a small block motor with dual quads on a tunnel ram. Owner did not know what size the motor is. I looked at the casting under the starter area and it reads:

2536030 318 7
I am assuming it's a 318, because of the 318 in a row. But it also has 360 in a row, too.
Does anyone here know for sure?
Please help
Author: Dizzle