Should I use the 67 single shear K frame?

I like your conversion and commented at your build thread that I do not have a way to make the pieces. I have a welder and can weld though.

So is the only downside to the 67 unit the replacement cost? Mine seems pretty tight. Anybody want to buy mine or better yet trade for a 68+ K frame with an idler arm so I stop thinking about stealing the one from the fish and doing a different thing with the fish front suspension?