...What kind of work are we talking to get the 1.3 manifold to work? Again, Thank You for your attention and advice.
A lot of work.
Aside from adapting the 1.3 intake to the intake ports on a 16-valve head, you have to do something about the injector ports, which will not be needed. You'll need to swap the Distributor out for A 1.3 L unit... You might as well find a 1.3 8-valve or a 1.6-8-valve head and swap it onto your 1.6 block.
The 1.6 block will take either the 1.6 8-valve or the 1.3 head! Also, you'll need a 1.3 intake manifold as it is better-suited for adapting to a carb than the Throttlebody Injection intakes found on 1.6 8-valves and late model (post '88.5) 1.3 engines.
You'll also need a low-pressure fuel pump and a regulator. If you find a 1.3 head with a manual fuel pump (located on the intake side of the head "around the corner" from the distributor) go ahead and take the pump off, remove the pump drive rod and install a block-off plate. The mechanical pump can be very unreliable and will "wash" your engine with gasoline if broken.
When you switch to another carburetor, you can pretty much remove all circuitry related to the carburetor including the ECU.
For a complete color-coded wiring diagram, go to Ack's FAQ (the link is in my signature, below) and do a search for
diagramI hope that this helps!