Here is what you will/might need to convert your EFI distributor to a carb distributor if you are using the a20a3/a20a4 head and plan on running carburetors
or
If you already have carbs and are swapping a Carb distributor to an EFI one because you preffer to run the EFI Distributor.
- A20A1/A20A2 (CARB) Distributor or A20A3/A20A4 (EFI) Distributor
- A20A1/A20A2 Cam Bearring (CARB) shown installed in the pic below.
I have the A20A3/A20A4 (EFI) Cam Bearring in my hand.
- A20A1/A20A2 (Carb) Themostat housing or A20A3/A20A4 Thermostat housing (EFI)

You might want to use the A20A3/A20A4 (EFI) Thermostat housing when using the EFI Distributor on the carb motor, since some people have said that the Carb thermostat housing gets in the way... I never tired the EFI distributor with the Carb thermostat housing so I wouldn't know.
(extra: If you need to, swap over any of the Thermovalves from the DX/LX Thermostat housing to the LXI housing, especcially if you intend to bypass the intake manifold heater (Carb). )
I like the LXI thermostat housing cause the temp sending unit for the guage cluster is on it... also you have extra ports to hook up your own coolant temp guage.
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