OK, under the hood most is done. I made a distribution box on top of the intake manifold. Mixing tube and backfire lid on top. Right behind is the woodgas inlet, right in front the air inlet. Upstream (black painted) a manual choke and a vacuum controlled one. Air filter will come behind the headlight.
Left in front is the IMPCO LPG carb, now tilted 90 degrees. When driving on woodgas or petrol, the 3" ball valve is closed. Left back is a Stromberg petrol carb for emergency, starting help and boost. Ball valve is open when driving on woodgas. The petrol throttle is only manually operated. It gets air from the IMPCO air filter. It was the original GM filter housing, but most of it ended in the trash bin.
The gas pedal operates the IMPCO. When the ball valve is closed to drive on woodgas, the linkage between IMPCO and woodgas mixer is fixed by a pin. The linkage is a rod that can slide in a tube. The pin connects them. The throttle valves of the woodgas mixer have there own manual idle setting, because when driving on LPG, the throttles are not allowed to leak dilluting air.
This is about the same setup as used on the Volvo. The vacuum control allows an adjustmentfree driving. Except when the gas quality changes, it needs adjustment, while the vacuum control does the fine tuning.
Getting the gas pipe along the chassis, through the fender and around the steering column was rather a challenge. I never make 90 degree elbows by cutting a pipe under 45 degrees. I always take smooth 90 degree welding curves (right word?) For a lesser angle the curves are cut up. It takes one welding seem extra and a bit more money for the welding curves, but the reward is a lesser pressure drop and a good looking tube.