New to site, new to Mopar overheating issues

Hello,

First post on the site, however I've already been using all the great information. I bought a 68 Barracuda convertible a couple of weeks ago and it needs some attention. One issue is that the car is overheating, when it's 90+ here in Kansas. Based on the vin the car was an original 6 cylinder car, but along the way someone put the 340 in it. The guy I bought it from owned the car for 2 months (small time deal in everything guy) and knew nothing about the car and any work done, just "drove it cause it was cool."
So here is the cooling set up:
- Fan with a broken shroud
- Electric Fan, on the grill side, that's wired wrong, drawing power from the alternator resistor with no regulator or temp sensor. It wasn't working, I had it running but now there's no power coming from the resistor FLN side now (separate issue) where it was wired into.
- First noticed the issue when I drove it home after buy it, was running about 3/4 of the way up the temp gauge then got one mark from the H so I pulled over. I tried running the heater but that doesn't seem to help.

I was going to get the stuff to fix the electric fan, but am wondering if I just get the shroud and original setup running right it might be best. Any help would be great, thank you.

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Ah the great Mopar cooling debate rages on everybody has to get their licks in.
Yr and Moparmat you are both correct with your over/under drive comments.
I will throw this in to the mix.
Not to long ago I spoke with a Engineer at Griffin about this very subject and he stated that" there is no way you can create too much flow through a radiator with an automotive water pump it would have to be very extreme"
Take it for what it is worth.