[Jack21]

TC,

When you say "Stock CR" radiator, do you mean the original brass one, or the newer Griffin aluminum one? If Griffin aluminum, you're OK. If not, I'd replace the old brass one with the Griffin before you start cutting up hoses.

The old CR brass radiator was marginal for a mild 302, much less a tweaked 351. If ya gotta, ya gotta, but my fear (and I think others here share this) is you'll soon be describing a raft of cooling system and overheating problems, only to find yourself yanking the OE CR rad out for the Griffin anyway.

And it doesn't stop there. Cobras are notorious for running hot, marginal cooling systems, and overheating. You'll need a high flow water pump, not an auto supply store rebuilt, the correct pulley ratios (If March, use street rod ratio), and a good electric fan. I'm using a Scott, but Don and DV have the best fans availavle for Cobras. You can use a 180 deg thermostat year round, but install a fan override switch on your dash so you can kick your fan in manually while sitting in traffic.

Then start on the hoses.