Just saw you're in Aptos. There's a shop in Watsonville my hot rod pals from Santa Cruz use for rads. Let me ask.
Orig Harrison rads are the best hands down.
Never give up a brass Harrison if you can avoid it.
Fix the tanks and get core rodded out
My 454 trucks hate anything but Harrison 4 core brass rads.
And I feel your pain...sick kid, sick wife, broken truck,
take it off, new crap part back on, broken again, back off, replacement crap back on, broken again....ugh...
PM me for your brake troubles.
Easier than you think