318 Power, with real street manners ?

Subscribed. It's pretty easy to build a 300 horse 318. Like @diymirage just said, the combination is the direction you need to go. As you probably know, The more horse the further away from "street manners" you get and everybody has a different opinion on what the street manners limit is. If you are planning on a mild 318 with stock converter and say 3:23 gears, You can use a cam with around 220° @ .050 duration, 4 barrel and intake to match, small tube headers and a nice 2 1/4" exhaust. With your choice of o/d or lock up tranny you should be able to get close to 20mpg hwy and probably run in the 14's or faster on the strip.