mopar or edelbrock intake?
Velocity. The bigger port 360 head doesn't have it on the smaller displacing 318.
If you speak with BJR racing, he could really help with the in's & out's with the head best.
For a comparo dyno tested by a been there done that fella, click this and scroll to the bottom right. The last 2 parragraphs have what your looking for.
http://www.geocities.com/alwest_83/318
So how does 40 HP sound by the right parts choice?