1963 Dart L6 Heater Core

Looking to get heat rolling through the cab finally and took my heater core to a local radiator repair shop and I'm quoted just over $200, saying there are two leaks and the core itself needs to basically be swapped out.

I've tried looking around online and haven't been able to find anything that's a confirmed match and it's my understanding that the firewall on the 63 is different from 64 onward so I need a very year specific heater core yes? Called the good local auto parts store and got a part number of 98503 but can't seem to get anything from them or available online.

I guess I'm wondering is $200 for a new heater core not bad considering I can't seem to find a more cost effective option locally or online. If anyone knows where I can get one for under $200 I'd be all about it but at this point I want to be able to thaw my windows and order new carpet already and just getting the risk of a leak out of the way is a bit more of a priority than saving 50 or so bucks.


Thanks