Today, dollar for dollar, is the 318 faster than the 340 ???

i run a 410 stroker in my car . 360 magnum based. but if i was doing a car that was more show than go, i would be temped to find a 318 magnum out of a truck. would have to be way cheaper than a 360 and set it up for peppy performance with decent gas milage. Love my 410 but she sucks the gas!!!