68-69 el camino project help

I have a 68 and a 69 el camino I am making into one. I am useing the 68 body. but everything off the 69. is there anything that wont cross over? I am useing the wiring from the 68. but the dash and guadges from the 69. the wiring is pretty much the same and looks like it will snap right in if i switch some connecters over. am i wrong?? will the finders from the 69 fit the 68? how about the windows? pretty much everything is being pulled from the 69 to the 68. what wont fit?

as i recall everything will swap over between these two years the only thing that really changed here was the grill dash cluster and i believe the tail lights but will all interchange good luck i love these two years i believe they were the sharpest looking of them all just my opinion