Motorhome carburetors are not the same as other units. If you contact me at the shop I can put together a rebuild kit with tuning parts so it works on the new 454 engine. It will need a high flow N/S assembly, HP accl pump, jets, metering rods and PP spring. I would need the carburetor part number off the drivers side of the carburetor. Also check side play at the primary shaft, and test the electric choke and choke pull-off (make sure it holds vacuum).......