You could fit a 32DFT.
This a auto choke(electric) unit with progressive action on the venturi's, which are vacuum controlled.
This was used on the 1300(OHV) from 78-82, as 32 DFT, XR2(OHV)81-83 used a similar one but was 32/34DFT 6, XR2(CVH) used a similar one 32/34DFT 4B.
tabetha