[Woj]

Pat, Here's what I found. The 396/325 hp radiator tanks are labeled IA for the left tank and XJ for the right tank, this is for a 4 speed, it is an original radiator. This I believe is what you'd ultimately want?

The IA (driver's side tank is is 2 1/2" wide and can accept a 3-row core), the passenger side tank is 3 1/8" wide and can accept a 4-row core (coded XJ). The measurement of the core is 29", this is the distance between tanks. If you have this, it should fit between your core support and the radiator top plate.

The 396/325 hp radiator is a two-row core. The 350/300 hp automatic with ac is also a two-row core. Both share the same driver's side tank, the 350/300 hp has a passenger side tank that can accept a 3-row core and is labeled CF (it is for an automatic with trans cooler).

Hope this info helps. PM me with your email if you'd like pictures.

If you are going to construct a radiator with the proper tanks, I'd recommend going with a 3-core, the correct tanks would accept that. Just a suggestion.

Phil Woj.