You may want to take some pics of your rad and post them on here. The only rad I'm aware of with a curved neck was in '69 Camaro COPO cars. It may have been transplanted into your Chevelle at some point. It may be of interest to others on here.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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