There should be a steel fuel line coming up from under the car on the right side of the engine bay, any decent auto supply place should be able to supply you with a length of flexible line.

If you don't already have one, you will need an abutment plate to hold the cable and direct it to the throttle arm on the carb

//www.minimania.com/part/3A0035/Hif6--Hif44-Carb-Abutment-Bracket

and a spacer

//www.minimania.com/part/12B561/Carb-Spacer-Hif6-hif44

a couple gaskets

//www.minimania.com/part/88G429/Hif6-Hif44-Gasket---Manifold-And-Spacer

this clip

//www.minimania.com/part/CZK6491/Clip-Choke-Cable-Hif

For throttle cable fine adjustment, I like to use a barrel adjuster from a bicycle, like this:

Use 2 of the nuts to lock into place.

Hi, Newbie here, I'd like to replace  my old twin hs2 carburetor with single HIF4, would like to get opinion/suggest for associate pasts like gasket, all cable,and fuel hose. I have HIF4 plus manifold . 

appreciate your input.