i recently bought a 67 chevelle with a 1969 350 corvette engine in it. the manifold casting
# is 8318803. does anyone know what is the correct manifold casting # for a 69 vette engine 300-350 horse power? the engine is fine and so is the chevelle but i want to put on the correct manifold. thanks jim

Are you sure it's not 3919803? Look closer.

If so, you intake originally came on:

1968 model year

Full Size 327/250,275 hp
Chevelle 327/250,275 and 325hp
Nova 327/275 and 325hp, 350/295hp
Camaro 327/275hp, 350/295hp
Corvette 327/300, 350hp

thanks mike your number is correct