Did any of the 66 Barracuda's come with a 318?

The fifth digit being a D is a 273. No 318's were ever used in 64-66 Barracuda's. 67 was the first year for a 318 LA

Absolutely correct Mike, but 273 was still available 'til '69, albeit with cast crank and hydro lifters...basically the LA318's little brother.