What size engine came with the 1968 Two Door Convertible?

you need to check the vin#, my grandfathers 67 had a 440.

A 68 bonne more than likely had a 400 or possibly a 389

I would go for the 389-400 as well. Less likely would be a 421, or a later 455

Pontiacs do not come with 440's. That is a Mopar engine

Aww, hell. I don't don't if the 428 was available in '68, though

I have one....Mine has a 428. It has the numbsers 428 on the driver and passenger side of the car, right behind the front wheels. Mine is a convertable...hope this helps

They came with a 400 and a 428.

400ci same with a 68 GTO

I want to know the length of the seats.

Is there a dual quad set up for that 428

Not from the factory.

66 was the last year for the 389