I'll ask the guy who just bushed my lifter bores. He told me he has to bore lifter holes in 23 R? blocks that his customer bought from Petty's. I can't remember if he said R3 or R5 blocks. If it's R5's, I'll get his customers number so I can hook y'all up.
I called and left a message about the heads, but have not heard back from him yet. He probably had machines running, and didn't hear the phone. I'll let you know when I hear something.