part numbers/casting numbers for 1968 L36

[John Brown]

[ QUOTE ]
If your car has a manual transmission, the RH ex manifold was #3918862. LH was #3989310. ~ ~ This info is from a GM full sized Chev parts book, #761, dated 1976.
The numbers given are listed as superceded numbers, so should be original.

[/ QUOTE ]

Mark, those numbers look to be supercessions of the original numbers. Colvins Chevrolet by the Numbers doesnt show the 3918862 at all and shows the 3989310 started in 1971. Of course there's always the possibility of misprints or Canadian production being different. I think you need to check it out a little more.

Most likely you will find you need 3916178 passenger side and 3914613 drivers side, but it pays to check further before spending the big bucks.