I've picked up a 429(?) engine for free. I'm wanting to rebuild the engine and the first thing I come across already stumped me and everyone I've called and anywhere I've looked online. The emissions decal is faded but I see enough on it to give me a little information about this engine. I see where the ignition timing is set at 4 degrees off center and idle setting at 590RPM for a automatic transmission. Their is no setting for a manual transmission. That's part of what's stumping people. But the biggest hang up is the D0AE-9C485-T. We all can find anything we want for that serial number under ever letter and letter combination in the alphabet except the letter T. I know the D0AE-9C485-S is a 351 and the D0AE-9C485-U is a 429. Does anyone know what the D0AE-9C485-T is? I've called many places and looked up many places online but to only stump everyone what the T series is. Thank you for any help.