Two Different Heads

Ports are the same size, types of rocker arms used have no influence on the heads themselves, regardless of style of rocker arm, they all bolt down the same. Based on my reference book "How to Hot Rod Small Block Mopars" I will say this: the 67 head is closed chamber, the other is open chamber. From 68 to 74 , they are all the same casting #: 2843675, with slight differences in finished chamber volume; which is larger than the 67 head. Look for another 67 head and you would be golden IF the difference bothers you. The 2 heads are for all intents and purposes, functional equivalents, if it were me I'd just bolt it together and not loose any sleep. You of course, can do what makes you feel good.
Good luck.