I converted my 53. There are a number of threads about the subject on the old site. The old site is maintained and searchable. I'd recommend spending some time there. You'll need to change your bulbs, generator & regulator and put a resistor on your gas gauge. I put a resistor on my heater motor as well but you won't have that issue. You should also put a 12v solenoid on your starter. The 6v starter will live on 12v just fine but the solenoid can be problematic. This is an old site thread on the solenoid saga I experienced.

https://vccachat.org/ubbthreads.php/ubb/showflat/Number/459822/Searchpage/1/Main/71918/Words/conversion/Search/true/re-53-starter.html#Post459822

FYI, I've had discussions with folks saying that they're not particularly pleased with the Antique Air AC conversion. They say the AC does not get cold. Cooler than outside air, yes but not the cold air we're used to with modern AC. I have no personal experience to share other than that hearsay.

@tiny Tiny, thanks for your response. The more I think about it, the more I think I should just leave it alone. It would be one less thing to go wrong at some point. It will spend it's useful life going to car shows and club meetings. The antique plate rules kinda suck in TN. They limit the driving to those kinds of things, but the purpose of having an old car is to enjoy driving it and just cruising. Others just never mind the rules and drive it when they want. You can always say you're testing it after maintenance or repair. Hey, I love old cars.

Apart from changing to alternator the existing coil only needs a resistor or change to a full 12v (most later coils were built for 9 volts), all light globes (including instrument, I would not worry about a resistor for the fuel guage or starter solenoid and the starter will work for a long time while you dont crank for a long period but will spin the motor at a speed faster than the engine will idle when the starter is released. Tiny's are good and I may be wrong with mine.

Tony

Here is an Ebay listing for a restored heater. It has a 12v motor. All it would take to make it work on your car is to put a 6v motor on the blower. 6v motors are available. As for the solenoid, you may or may not have an issue with the 6v solenoid if you do convert. I did. You can also put a Parts Wanted ad for a heater in our Classifieds section at the top of the page. You can also peruse ebay regularly. Watch for people parting out a 53 or 54 car. Even if they don't have the heater listed you can message them and ask if the car they're parting has a heater and if they're going to list it. Good luck.

It's pretty clear you guys have been around the "restore the old clunker" a while. I really would like to keep this car as original I can. Really, with all the windows down and vents open, I can endure the heat at least for the short trips I would be making with it. On my 41, I've been enjoying driving it despite the heat. Thanks for your efforts to help. If someone had a pic of what the heater looks like, it would surely help the search for one. 

I listed it per your suggestion, Tiny. Thanks.

@jerry-berry A little info on the heater.      https://www.chevytalk.org/fusionbb/showtopic.php?tid/353248/

I had a 54 210 with heat back in my high school days. Never knew they didn't come with a heater.  For now, I won't worry about it, but thanks for the link. I read a good bit of it and don't think it would be too difficult to retro fit. I will be looking for a decent parts car nearby that I can scavenge parts off of when I decide.