Best Years for the 318 LA?

'66 would be coming off a 273. The best head to ever come on a factory 318 for performance was the magnum heads. But the OP said LA.
LOL Ya, Teens like small chambered heads. (or big valve, big port) Ma Mopar wanted the teen to be a mundane no frills workhorse. They should have juiced one up like they did with the 273. Not even saying what the 340 was all about.