Introduction, and trans issue

The Villian said

Hello,
This my first post so I will say a little about what I have. I have a 1968 dart 318 with A-904 8.25 rear end, it is a little off but I like it. It is my first dodge ever But not my first classic. So I installed a edelbrock proflow 4 and after market lokar kickdown cable. So now I can not get the trans to shift back into 3rd after it kickdown into 2nd after I get into it. I checked kickdown and it seems to be adjusted ok, 1st to 2nd shifts at about 20mph and 2nd to 3rd about 40 ish. What do you guys think. Thank you for the help.

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You're combination of line-pressure plus throttle pressure and/or governor pressure, is too high. Probably a misadjusted cable or linkage, or a sticking cable, or bent anchor, etc. You may need to put a return spring on the TV lever down at the trans end.
Here's the test;
Disconnect the cable at both ends and roadtest her. The shifts should come quick and soft. Do not use more than 50% throttle while in this mode or you could cook the friction materials. But around the block will be fine.
If you have to operate in this mode for longer,then tie the KD lever on the trans rearward at least 70/80% of it's sprung travel, and disconnect the secondaries or don't use them. I have operated this way for thousands of miles.
If the shift rpm is too high for you, decrease the tie-back , but then also use less throttle during the shifts.