Chevy 350 Small-Block Carb To TBI Conversion - Modern Improvement

It is mandatory the large-capacity fuel filter (included) precedes the electric fuel pump coming from the gas tank.

Note that arrows indicate flow direction on the filter and fuel pump. An existing hole in the C10 frame was used to route the fuel line. Never drill any extra holes into your truck that you don't have to.

As per a factory installation the best place to mount the ECM (computer brain) is inside the cab on the passenger side. This meant a path had to be made for the wiring harness to pass from the engine compartment to inside the cab.

A very invasive hole needed to be cut through the firewall to allow the two large ECM plugs to pass through.

Two 3/4-inch round holes were cut to the right width and were connected to form an oval with a pneumatic hacksaw.

A real clean job, if I do say so myself.

With Howell's special wiring harness attached, the ECM rested nicely behind the glovebox door, and above the factory A/C unit.

This bung for the O2 sensor (included) was welded onto the passenger side exhaust in between the exhaust manifold and the catalytic converter. All of the connecting plugs are labeled (white tagged) to simplify placement.

The knock sensor (included) was installed by removing the block drain plug on the passenger side and threading it into in the drain plug's hole.

The stock Rochester Quadrajet four-barrel carburetor was removed and the intake manifold's surface was scraped clean with a single-edged razor blade.

Then the billet aluminum TBI adapter plate was mounted onto the intake manifold separately from the TBI.

Next, the TBI throttle body was mounted to the adapter plate, and the white-tagged plugs on the wiring harness were checked to make they were routed properly and could reach their intended connections (sensors, distributor, etc.).