when i get my holly 4bbl carb what would be the best linkage to use for my duster and what length

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1973 plymouth duster 225 slant six .30 over, erson 270 cam, 9.5 to 1 compression, big valves, headers, and a holley 4 bbl
http://cardomain.com/ride/3135091

hey that thing got a hemi? naw its just a slant six

Not sure exactly what you are asking, and which model Holley carburetor you intend to use. But, you will find that your existing throttle cable most likely will work. However you may need to adapt the Holley to accept Chrysler cables & peddle travel with: this, a Holley adapter bracket 20-7 and a stud, and perhaps a throttle return spring kit. ( I used Summit SUM-G1327 made for a 4160 @ 9 bucks) You also may need an electric choke.

My 4160 up sitting on a Clifford intake, using Summit spring kit, BPE cable bracket, and Holley adapter 20-7. I have a 904, so additionaly there is a kick down cable mounted below the throttle cable that you will not need with a standard transmission:

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

i was going to try the holley 570 street avenger with electric choke. i think that is like a 4150

but i still dont under stand bout the linkage.

i was looking at the locar universal linkage didnt know if i could use it.

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1973 plymouth duster 225 slant six .30 over, erson 270 cam, 9.5 to 1 compression, big valves, headers, and a holley 4 bbl
http://cardomain.com/ride/3135091

hey that thing got a hemi? naw its just a slant six