429/460 block ID pics that show the differences in main saddle areas.
The deck heights changed in 71 to approx 10.310" and I beleive this would be A2A blocks and the around mid 71 and 72 and later they changed to 10.322", this would be the A2B. All this happened around the time the cam gears change and added the 4* of retard.
96 Ford F350 PSD CC DRW
64 Fairlaine 500 rust bucket/future Tbolt clone with 501 BBF