Your #1 could mean 1 of 3 things: 1 denotes your paint is standard GM paint not a Pontiac color or: 1 denotes that it is a white (ivory) convertiable top or: 1 denotes that it is a white (ivory) vinyl topby s sheeder - Pontiac GTO Forum
You need to have the 8 bolt timing chain cover (8 bolts hold the water pump on, 11 bolt timing chain cover is the later style, 69 and up). On the back of the timing chain cover on the earlier ones (8 bolt style), there is a dimple or notch for the thermostat housing. I have used the later timing chain covers with tri-powers but you can not use the correct thermostat housing.by s sheeder - Pontiac GTO Forum
Your GTO is a 66 sedan(two door post), meaning there is a post that separates the door glass from the back glass. A 6 cylinder was never sold in any GTO. 24207 decodes like this: 2- Pontiac division 42- GTO series 07- 2 door sport coupeby s sheeder - Pontiac GTO Forum