b18c1 internals in a B18a

I am considering purchasing a 1991 integra LS. The owner has informed me that the engine is b18a with b18c1 pistons, rods, cams, and an upgraded fuel system. What will this do to the engine and what kind of performance gains can be expected? The car also has a JUN flywheel...will that affect driveability? Thanks for your help.

Chan

the B18C1 cams wont go into the non vtec head ive been told, and as far as what it will do it will lower your displacement. now does he have the whole GSR head on it? if it is LSVTEC then its basically a B18C1 without the piston squirters and a few other minro differences.