360 heads on a 318 of any benefit?

The 360 heads can flow more due to larger valves. They also have larger runners, so the stock 318 stuff will create bad flow characteristics in the runners. Aftermarket intakes, and a stock 360 intake will work and will avoid this problem. The other issue could be compression ratio. Much of this depends on the configuration of your engine. If its stock, it may lower the CR a bit.