Whoa guys. lets step back a little.
MountainMan73 got a 69 Dart with a 318 that's been sitting.
First thing I'll say is that whomever said what you need to do is get a new carb meant well, but what it may have really done is saved you from burning up the trans. I say that because that setup was not ready to run.
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The upper transmission linkage rod has been modified. See arrow.
I can't see what the rest of the linkage looks like.
There was a three rod linkage that was used for a number of years in A-bodies. Then there was two rod linkage used in later B-bodies and maybe eventually A-bodies and F bodies. Or maybe not in the smaller cars because of insufficient clearance.
The early three piece setups have an intermediate rod that can be adjusted.
Take a look and see what you have.
All of them will connect to the throttle pressure lever on the transmission.
At rest (idle) that lever should be all the way forward, as should the top rod with the slot.
At full throttle, that lever should be all the way back.
Before doing any of that, set the throttle cable up. The cable should allow the throttles to be completely closed at idle. Back the knurled slotted screw up (not removing it) and the throttle cable should have zero to a little slack, but no tension. Get someone to step on the throttle pedal, and see if the throttle is fully open. If you can open the throttles further by hand, then the cable needs to be tightened.
Then after the throttle cable has been set you can go onto the trasnmission linkage.
One possible issue with the throttle cable bracket is that it looks low. Probably originally for a 2bbl or single plane intake manifold where the carb sits lower. You can replace it, you can probably bend it up, and there's anotehr workaround I'm forgetting. But whichever method you choose the goal is have the cable and housing a little more in line with the attachment point on the carb.
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There's a 1971 Master Tech Conference that has illustrations and explanation about th eautomatic transmission linkage.
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also avail at
www.mymopar.com
As far as the Holley goes, sure after sitting 15 years replacing the gaskets and cleaning varnish from dried fuel is well advised. Really not too hard. First time can seem like a bunch of parts but once you've done it the next time will be easier. Also reading up on how it works will make it easier to recognize the parts by function. Mr Tech (Master Tech Conference) has you covered there as well.