Mopar 318/275 HP vs. Chevy 327/275 HP 'L-30'

So there were plans to make a hotted-up version of the 318?? Nebver heard of this...

If that was on the table in 1966, I'd be surprised if the program wasn't just cancelled in favor of the 340 which came along a couple years later...presumably, production costs would only have been higher to make a similar performing engine on fewer cubes.

But...I like the idea of a sub-340 performance option...and there certainly were more superfluous engine options back in the day...so it's a shame it didn't come along.

What's the deal with the Mexican high performance 318? Was it any different? 4bbl, I assume??