[hugger6933]

Keep in mind that different sized motors act differently with a cam swap. A 268H from comp cams would be near perfect if you were running a 350. I have had a bunch of those and they always are good. BUT that 268 in a 350 may seem more like a 278 [or so just for conversation] in your 307. I would back up two ranges like a 250 ish I dont remember the size of the 250 comp cam but it is also known as the rv type cam. You could add that cam without the headers but if you want the benefits get some cause they will pep you up.
I want to top the post by saying I used to have a small big block in my Chevelle car and it had a cam that made it sound like a pro mod. I changed it out for a couple sizes smaller and added a different carb and it picked up half a second at the track. That is a lot going from a 8.25 to 7.75 in the eighth. So just think bigger is not always better. On the other hand if you had a 400 small block the same 268H cam would seem like an RV cam to the 400. Does that make sense? Jim