The 350 engine and drive train on the car are all original to the car. It still has the original 2bbl carb and intake. With the heads possibly being an exception. The car is a late 69 350. The current #11 heads are date code late 69. I don't know if the heads are original or not... I think the heads may have been swapped for a set already set up for pump gas during a very basic rebuild in the mid 90s but I have been told it is possible that some late 69s may have worn 11s from the factory. I have very good knowledge of this car since I am the second owner, the first being my father in law. However he has passed away and with him went some of the details. I did ask him once about gas and hardened valves and he said that was taken care of. At the time the importance of how was not important to me.
If I am reading the head numbers correct, and of course the chambers measure to match... the 46 heads appear to be a decent bump in compression without moving to big valve heads. If that is in fact correct they would seem to be great on a 350 build looking for 300-325 hp. They should... all else being equal... offer a bump over the other small valve 350 players 17, 47, 11. What I still don't know is what bump? Getting big valve heads on the 350 might not be the right move either. And chances are any of those will need the same work as the old 46s?
