I've got the information You're looking for - and it is very interesting:
Swiss-made Barracudas 1967 - 1969:
1967: 273 - 2bbl and 273 - 4 bbl, no slant sixes.
1968: 273 - 2 bbl and 340s
1969: 273 - 2 bbl and 340s
Obviously 273 engines leftovers were still sent to Schinznach in 68 and 69; the engines were still painted red. There were no 318s offered in swiss Barracudas. Nearly all Barracudas were fastbacks, but there are few notchbacks (only with 273 c.i.) known. Convertibles were imported - not swiss made - but sold by AMAG; these convertibles got the US-motorization: 225 c.i., 318 c.i. and 340 c.i. Only one big block Barracuda is known and this was a modified race car:
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Most of the swiss Barracudas in 68 and 69 seemed to be 340 - Fastbacks. I think they outnumbered the 273 c.i. Barracudas by 4 to 1. I believe they built in these 2 years about 130 - 150 Barracudas equipped with the 340 in Schinznach - therefore the fame of the 340 is still big in Switzerland - nearly every even lesser car enthusiast knows this engine. But exact numbers broken down to motorization are not available; same story as with my Demon; also concerning the leftover engine story.