$0.02
Griffin rad not specific for AT use. Cap inlet & outlet of AT cooler for MT use.
Would not attempt using rad AT cooler for engine
oil. Grossly insuffucuent flow for engine
oil. Use an engine
oil cooler instead.
Do you need an engine oil cooler at all? The original 427 FE's under racing conditions (track surface temp 110 - 125 deg in the summer) using oils available 35 years ago makes sense. Does the oil in your stroker 351 (assuming use of a road racing 8 or 9 qt oil pan) and
synthetic oil get too hot? First, try a heat dissipating polymer coating on your oil pan (keep it simple). If that doesn't do it, use a thermostat controlled engine oil cooler.