I find the IL tanks on Chevelles too but the X code tank may have come from a full size car and yes, these tanks are very interchangeable, as long as the core is the correct width for the tank.
The fan, if it is too small a diameter to fill the shroud, it won't be effective and in the couple pics we see, it has been noted that it isn't far enough in the shroud. It is mounted directly to the pulley and it should have a 3/4 to 1" spacer behind it.
What is the diameter of the fan shroud opening ? That will determine the fan blade size.
I'm having eye surgery tomorrow, so I'll look thru my fans later this week.
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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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