how can i get 400hp out of a 318?
Call me skeptical, but, I don't see any of those magazine 400hp/318 builds powering a 3200-3300# car to about 110-112mph in the 1/4, which a true 400hp engine should do.
A well tuned 9.5:1 360 with a xe268h will get you about 1hp per ci. Putting a cam with slightly more duration lift in a 318 gets you 50+ hp over a similar 360? Along with the recent 360/10:1/RHS/XE275HL/1.6 rockers/Air Gap/750DP making 427hp/440tq. Some things don't add up, that's why I'm skeptical.
A 318 at 400hp is going to have a really nasty cam in it, some compression and good heads ( not valve jobbed 340-360 pieces). JMO.