302 heads
Yes, they are swirl PORT heads. Ports are not chambers. The 308's are also open chamber, and have the larger 360 sized ports. The section right after the bit you highlighted says the chambers are similar to the earlier 340/360 heads, which are open chambers.
This is a picture of the 308's on my 340. They're obviously open chambers. In fact, the only reason I used the 308's and had them ported was because they are open chambers and would clear the pistons in my 340, which are .018" proud of the deck. You can just about make out the "308" casting number as well, it's upside down on the top right.
Yes, they are swirl PORT heads. Ports are not chambers. The 308's are also open chamber, and have the larger 360 sized ports. The section right after the bit you highlighted says the chambers are similar to the earlier 340/360 heads, which are open chambers.
This is a picture of the 308's on my 340. They're obviously open chambers. In fact, the only reason I used the 308's and had them ported was because they are open chambers and would clear the pistons in my 340, which are .018" proud of the deck. You can just about make out the "308" casting number as well, it's upside down on the top right.