The newer 347 stroker have better pistons. I think the "
oil use" problem is a thing of the past. Maybe the guys that run 347s can chime in and share their experience. The different in HP between the 331 and 347 ( in a street car ) is not much. But I like the 347!
I see you live in Flordia. Drain the water / anti freeze out of your Cobra and fill it with distilled water. See if it runs cooler. More Cobras over heat because they have to much anti freeze in the cooling system than any other problem. You should not run more than 50/50. I recomend 25%
antifreeze 75% distilled water because we don't drive them in real cold weather and they stay in a garage during cold weather. Buy a pyrometer and check to see if the temperature gauge is correct. I've seen them 15 degrees off. A high volume water pump would be the next thing.
best of luck and see ya in Ohio in June!!
Dwight