273 said

I don't see any evidence a 318 needs a lot more head, carb, cam etc. To make 400 hp.

Look at those 400 hp 318 combos, it's basically headers, airgap, 750, 224-240 cam, 9.5-10.5:1 cr, heads that flow 220-230 cfms, you look at 400 hp 340/360 builds pretty much the same recipe.

400-450 hp 340/360's

https://www.motortrend.com/articles/mopp-0102-1970-340-high-performance-mill-dyno/

https://www.motortrend.com/articles/59l-magnum-engine-make-mine-a-5-9/

https://www.motortrend.com/articles/mopp-0303-360-crate-engine-buildup/

https://www.motortrend.com/articles/mopp-0007-chrysler-360-engine/

https://www.motortrend.com/articles/hrdp-0804-small-block-mopar-engine/

Click to expand...