1973 340 Cam advice

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I'm really after a bit of fun.
I don't do more than 500 miles a year
and don't care about motorway RPMs
and
just wanna mess around in the roads.
As a point of interest I have another '73 340 that will be getting built over the next year with 1970 stock 340 rotating parts and heads so
my money will be going into that project.

The 340 I've just got only has the 2bbl manifold and all the other bits and bobs, Dizzy etc. (Can that be used in a 4bbl?) Yes
I'm not wanting to spend more than I have to get it running
in the Charger. The Weiand was thrown in with the deal so I'd prefer to just use that and put a second hand carb on.
I'd be happy changing (
the cam if it made a noticeable difference and) the rear gears too
as they will stay when the other 340 is ready
.

3.91s and drop the 340 in exactly as it is, 2bbl and at all
Hit 62mph @6000,in second gear, badaboom!
If you score, in your price range, a suitable: 4bbl,cable bracket,and air filter house, then add that, since you have a manifold.