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I have a D1ZF GA carb. Shows in the ford parts manual as a 1971 Boss and CJ 351. Has Autolite bowl cover with large fuel inlet. Rochester carb rebuilder says it is a late 71 service replacement as it was a rochester design. Has a lockdown for the kickdown. Does anyone have any documentation of...

 Not sure if this helps as this takes a bit of nerve and sounds a bit shade tree. I had to keep mine to the numbers and was tired of the leaks and had problems with aftermarket carbs. Hard to do to 1 of 398 HO carbs but its done now. Learned this from a old Ford mechanic.   Bowl cover distorts...

Don't forget the ground! https://secure.cougarpartscatalog.com/71grndstrap.html?attribs=82

This is an old post but I thought I would add to it.  72 351 HO R code had the bigger balancer, Nodular 4M crankshaft, D1ZX-AA boss Rods, 4V open chamber heads, Timing pointer with hole for pickup, Buddy bar aluminum intake, 4300d Motorcraft GA Carb, BA dipstick, Aluminum Valve covers...

72 R code Mach 1

Cj Pony shows them. 3 is correct. Ohio mustang may have the also but you would have to call. http://www.cjponyparts.com/fuel-line-grommet-all-1971-1973/p/HW926/

And another 72 R Code.