I did the same swap, you should get the throttle bracket from the 340 as well and the upper portion of the throttle pressure linkage. You didn't say what carb, is it a TQ? I run the 340 intake and a large primary TQ on my teen and it runs great. I also did a cam swap and headers. Composite gaskets for the 340 intake. Just make sure your surfaces are clean and dry. On the ends I took the cork gaskets and set them on with black rtv and put a little weight on them and let them sit overnight. Then I put a bead on top before installing the intake, it worked great and no leaks. After installing everything make sure that at WOT your lever on the trans is all the way back but not putting undo pressure on the lever.