My 170 did too!
My 170 did too but I think the body on the 021-025 carb must be slightly taller and when you put the thicker intelli cover on it, the cover contacts the plastic intake housing on the upper starter side I think, but it should be fairly easy to take care of that If you have to, hopefully yours will fit better than mine did.My 180 uses the intelicarb cover. I saw the partially tooled impulse passages on my 260 carb. Should be easy. I already drilled the hole for the idle screw since the carb that's on it is not original