I haven't switched intakes, I have the stock cast intake still. I don't think clearance is an issue though. Many have swapped engines, intakes, and carbs without having to add a scoop. You might want to message Pettybludart (Scott). He put a stroker in his 66 with no scoops. Just a word of caution, the 340 intakes have huge ports compared to the 273's ports and that mismatch can cause performance issues. Mike