The cams were the same for both of the 302's in 68. The extra compression and hp came from the heads because of the smaller combustion chamber. Even if you're rebuilding for show, nobody can see the cam. Get a modern grind that optimizes the way the car will be used. Or if you're set on the stock cam, either Crane or Comp probably makes a OEM replacement. I just put a Comp Cams XE262H in my 68 J code motor and I love it. It's not a stock grind, but it has lots of mid-range torque.

That's a very nice looking 68 you have!

65 FB "J" 302 lots of mods. 99 Windstar. 81 VW PU (gas) http://albums.photopoint.com/j/View?u=1590489&a=12113030&p=50486170.jpg

 

I have heard that the j code heads have a smaller combustion chamber leading to higher compression. I have also heard the chamber is not smaller and that the additional compression is from the stroke length. Do you know which is correct? I am thinking about changing the heads and intake on my 289 2bbl to j code so I am of course curious.

1968 Gulfstream Aqua Sprint Fastback 289 project