I believe I read some where (Tex Smith Hemi Book?) that besides the different outlets that some of the marine Hemis were also set up to run in the opposite direction for dual engine boats. One of the neat pieces that some of the Marine engines had was a dual One Barrel or dual two barrel carb intake (I recall seeing images of both). They show up on E Bay occasionally and I always thought it would be interesting to play with, but could never justify what they usually went for just to have a conversation piece.

The 354 in my 57 Plymouth also started out as an Industrial I was told that it originally resided in a "big" Dodge truck. It still has the "Industrial Engine" brass tag with all the specs attached. I was pleasantly surprised to find out it also has the triple 5 heads.

BT by M Patterson, on Flickr