[Chrysler300] 300C carb id needed

[christopher beilby <thelastbestgenius@xxxxxxxxxxx>]

Two of my 300Cs don't have electric pumps to make starting easier after standing, and my little bottle of fuel to tip some in rear carb made me notice something wrong/odd when I went to move it so I could mow the grass that had grown up under it over what was a pretty dry winter luckily.
 
And so after another hot mongrel 110 degree day here yesterday, I thought I would tackle something simple - namely find out why fuel seeped out around where the rear carb bolted onto the manifold - this a sign to me there might be a gasket problem.
 
First question - on 300Cs, what is correct gasket under carbs - the rear one had a sort of asbestos/grey type material with a steel shim centre - this I presume to block heat.
 
Second question - this 300C has carbs that have no rear counterweighted top throttle plates - I know this not usual - wrong?  The carbs are correct looking WCFBs otherwise, but when I took rear carb off to remove remains of old gasket, I noted no numbers stamped at front, but instead 1446 stamped on underside where it would normally be hidden by gasket - anyone know what this number means ? Or is it a SR number perhaps?
 
This 300C has always run like a pig, seems gutless re other two, despite seeming good motorwise - I have never checked valve clearances, and they are not as rattly as other two - maybe I will check this next. The car had real early transitor ignition, bit of other go fast stuff - so maybe some early hot up mods - carbs might be origs with baffles removed, however looks factory type plugs where counterweight shafts would come tjhrough carb bodies. Does this stamped number say anything re what carb is off/for?
 
Third question - can you buy the fine springs that are on the (I think) metering rods that move up and down inside the carbs? Maybe they are wrong - as motor is a bit better, more OK, once not on idle.
 
Fourth question - I have a Carter (AFB I think ?!) off a 57 Imperial 392 - today I realised they are same bolt/gasket pattern as 300C WCFBs - and would fit if one angled the brake vacuum pickup where screwed into intake manifold- is this true, and has anyone tried a pair of them on 300C, rather than the somewhat flawed WCFBs, and did 300D or E use this type?
 
Good news is car runs a bit better, and unlike last time when I only moved it 25 feet forward, this time I didn't run over an old fence joiner that likely had been lying unseen on ground for maybe 20+ years - couldn't believe next morning tire was flat and saw it sticking on tire tread - I had only moved it a few feet!!!  (Reminds me of my vintage car days and hot weather - I would be up paddock or if in the house, and when over 110 degrees one would hear like a loud explosion, rush outside, and amongst near 30 old cars around sheds/house, one quickly looks for the dust, and the flat/blown tire engulfed in dust cloud - old T Model Fords had beaded edge tires and with age and heat the bead would let go - that and old 21 to 24 inch tires that needed high pressures.  Modern large 14 inch tires might be harder to get lately in narrow whitewalls, but give me them any day over changing old vintage and veteran rims/wheels.)
 
Christopher in a record hot Australia December in most of the south, and this weekend now suffering record rain/floods on east coast - 17 inches rain in just over a day where that amount nearly is a good year's average 
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