BBC 68 Fan shrouds are very hard to find . When you do find one you can expect to pay 450 USD + . I've heard there are some aftermarket out there with poor reviews
Parts book says 1968 B body Pontiac and B body Chev use part number 3934500 (original part # was 3926847) for 396 or 427.
On a side note, it appears if you can find ANY 1966 B body V8 Chev with a shroud it will also be 3934500 but 1967 Chev is different. Odd.... Also, it appears that 1966 - 1967 396 or 427 Canadian Pontiac with a shroud also uses 3934500....
Confused yet?
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)