340 Intake Manifold

Not trying to hijack...but is there a difference in the 340 intake manifolds(stock ones) meaning a difference between a 68-72 and a 73 340 intake.. I STILL have the 340 stock intake but right now its got a Edelbrock Performer on it(no not the RPM)...would there be a difference between the stock intake for the 73 and the Edelbrock Performer? I also have a guy that I know that has a LD4B in his workshop he has had it for years and may(no idea) let it go cheap since he does not even have a car anymore....sorry to semi hijack but ive been wondering this question Darius posted for a while....and him posting this got my mind working again.