Need to purchase a new, repo radiator tag. Can someone inform me waht tag code is needed for an October 1969 dated car, with 350 engine, 350 trans, 4-core radiator?

... October 1969 dated car, with 350 engine, 350 trans, 4-core radiator?

"You Honor, that's a trick question" l:)
Since there was no '4-core' (or row) radiator available for the L-48 it is probably a mute question ...
You could just install an "OG" tag on it and let folks figure it's the original for the engine - or do something like a "CH" for a BB and let them guess ;)