Those heads are for a 1986@1988 350 EFI . Intake valve 1.94 Exhaust valve 1.5001
Dont know the CC's but they where used in the Impala fuel-injected police cars.Not on the Caprice cause the Caprice of those years where equipped with a 4 barrels carb.The only Caprice that used the EFI was in reality a TBI on the 262 CID.
If you got more question write me back at tekno_x80@hotmail.com
Eric