Well first the Steve Christ " How to rebuild your big block Ford" is a good start for some quick number and tech info. I think the rods you have are C7AE-B not R. Some of the casting numbers are faint and hard to id. Anyhow the rods are 390/428/427 rods and some prefer them to the Lemans cap screw type. Overall an excellent rod. The heads are listed as 66 352 only heads. What only means maybe specific to the 66 year only for the 352 my guess. They have 71.2-74.2 cc chambers. Hope this helps you out some....G.