63 Dart overheating issue

Rug_Trucker said

When filling wait for the gauge to tick upwards to show the thermostat came open, and not installed backwards. Then top off. Your system wasn't originally designed for a overflow reservoir. You may need to go to a different pressure rated cap.

I am sure you have E10 in Canada. Ethanol will yellow and crack that filter. Go to a metal filter. Don't use one of those turd glass filters either.

I swapped an F body radiator into my Duster. It kept puking coolant. It was designed to have an overflow bottle with that radiator cap. I added one before going to the track.

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None of these radiators are "designed" to be "With or W/O" overflow reservoirs. No reservoir= fill & leave an air gap in top of rad tank for expansion, reservoir= fill it to the tippy-top. A number of old-school rads had a strip of brass soldered in the tank that indicated where You should stop filling them.
I added a reservoir to My '72 Swinger A/C car, doing nothing else but filling it to the top. You should always run a higher pressure cap, regardless of the use of a recovery tank/reservoir.

You're 100% right on the fuel filters, those are great if you're dealing with an issue to monitor for excessive dirt & debris, and to check for adequate fuel flow. Once things are OK tho', pitch 'em & put a proper metal filter on!!!