I was planning to do a 318 but my car came with a 360.
Its not 318 sucks but 360 does has advantages especially for a street car.
Basically a 360 can go 2 steps up in cam and have the same streetability as a 318, and needs about 2 steps less gear for the same performance.
But I feel as long as your willing to gear it then build it. If not build bigger.