Personally, I love the 340 as is and would never stroke that one. I'd put the stroker in a 360 or a magnum 360. If I wanted to use roller lifters I'd use the magnum. I'm in the same situation and have a couple 340's and a 360 police motor and a magnum and that's the plan I came up with.
The only thing I’m worried about the power handling capabilities. The 340 block I had in my duster cracked. I just don’t want the same thing to happen again, hence why I’m looking for a later magnum block