66 slant 6

Hello to everyone. Glad to be here. I had a 65 Dart GT 4 gear hi-po way back in 65. only new car i have ever had. got drafted in 68, sold the 65. i was stationed in california. bought a 66 Dart gt 4 gear hi-po in 70. got out of the service in 72, sold the 66 and came home. Wish i still had both of them. Anyway, now i have a 66 Dart 4 door with a slant 6. this one keeps me out of trouble. i have had her for twenty years now. she runs like a top. I painted her the same color as the other two. I have a question. She needs a new radiator. i have searched the internet. not much luck. i really would like to put an aluminum one in her without modifications. i had the current one re-cored eight years ago and now it is starting to leak. Any input would be appreciated. Thanks a bunch