Removing the heat riser is a waste of time. Without it your carburetor will start to ice up in under 50* of damp weather. Welding a plate to the top of the exhaust manifold to "shield" the intake is also a waste of time. The purpose of the heat riser is to force the exhaust gases up against the bottom of the intake, without it, the exhaust flows smoothly out the exhaust pipe.
Removing "heat" from the carburetor makes sense when the carburetor sits in the middle of a large heat source such as a V8. With a inline engine the carburetor is several inches from the heat source and needs "heat" to help atomize the fuel for distribution.
The "Hyper Pak" didn't have provisions for a manifold heat source because it was an over the counter dealer option for off road performance activities. If you talk to anybody that has installed the manifold, you will find that they are miserable for daily driving and take forever to heat up to properly distribute the fuel.