Help choose engine for my 68 Barracuda

360 all the way. You can put some good pistons in since it needs it anyway. built 360s are MEAN!!!

The 318 will probably leave you with a feeling of wanting more later.

The 340 is an overpriced version of the 318 ....they have the same stroke.

The 360 with good pistons and a good over all build will be the way to go for overall cost and what get out of it.