How to run Deployed Pkg's at 64 bit

Hello, I'm on a single SQL Server instance and box where both Dev and prod occur. I have VS 2015 installed, with Teradata Drivers and Attunity driver to reach the data source. All that is 32 bit for the VS/SSDT needs. The pkgs get deployed, and a job is created, steps added, etc and then its scheduled and runs. But it runs in 32 bit for the connection, as that's what is used to design the pkg.
I have also installed  Teradata 64 bit driver and 64 Attunity on the same one server as well. Is, or would, the easiest way to switch my job that runs the steps, in the connection manager or the SSISDB? I look, both places look similar, with this is as a connection string: {Teradata};CHARSET=UTF8;LOGINTIMEOUT=20;DBCNAME=<sysnamehere>;UID=<usernamehere>;DATABASE=;ACCOUNT=;AUTHENTICATION=;WINAUTH=0. I'm not really seeing a good place to switch the jobs connection to use 64 drivers and providers. Thanks