[JChlupsa]

Engine Number: TI12IMY 18N351287
Manifold Number: 3883948

T1121MY +
T= Tonawanda Engine Plant
11= November
21= Day of the month
MY= 396/325 HP with Turbo Tranny

18N351287 +
1= Chevy Division
8= 1968
N= Norwood Assembly Plant
351287= Vehicle Seq Number off the Norwood Plants line. If its is being called a numbers matching car the number should also match the Cars VIN. Since its a 68 model car and the VIN seq number stars with 3xxxxx its out of a Camaro.

3883948= This intake was used from 1966-1968 on both 396 and 427 engines. for the 68 model year on a Camaro it was used on the 396/325 & 350 HP engines and was topped off with a Rochester Q-jet carb You should be looking for a Rochester 4 BBl Carb Number 7028210--4MV which could also be found on Chevelle and regular Passenger cars with the same engine (396/325 HP/Auto Tranny)