Re: 390ci or 360ci?
Well, you have yourself a pickle. As you stated, the 360 and 390 are the same block, different stroke. Several things could have happened.
- They could have had the parts to retro the block just to get it out the door.
- They could have said the hell with it and handed him a truck with a 360 since, unless you look up the VIN's, it's difficult to tell.
- They could have done a full engine swap.
- The whole story could be BS from either the previous owner or his uncle.
There are numbers stamped on the block and on the heads (have to remove the valve covers) and look them up in an interchange book. Unfortunately, due to it's age, it's really hard to tell what may be rotating inside that block. Fortunately, everything else is interchangeable.
Chewing on asphalt and drinking dinosaur wine