[bmalone]

Mike:

I pulled this from my earlier post:

"In your first picture, the intake ports in the head do not look tall enough to be HRs. C3AE-6090-K is the first iteration of HR head. The second is C4AE-6090-F, which was used up till early '65. Make sure you look at the last digit (K, or F), as that is the change code and further helps identify the part. HR intake ports measure 2.78 x 1.38. MRs measure 2.06 x 1.38, and LRs are 2.34 x 1.34 "

The change code should be K or F for the 427 HR. I think C4AE-6090C would be a standard 390 head.