318 camshaft swap 260 duration

You may be right;
Per post #1, the engine is already built, and no compression stated. Since it wasn't important enough to brag on, I assumed it's still sub 8/1. But if the Scr at the 69 spec , then you are right.
Think your overstating the facts here. Yes hopefully the OP is at least building some CR into his build 8.8-9:1 would nice but if not I still think he'll happy with a mild cam over stock.
Yes compression is 8.1