LD4B OR LD340 FOR 273?? Coil mount?? Need pics

What heads do you have on the 273? LD340 ports will be too big and overlap the OEM ports. But more importantly, 273's came with 2 different heads and I don't recall when the changover occurred. Early ones had different size & angle intake bolts and an LD4B and LD340 wouldn't work anyway. I believe a D4B would have the correct bolt angles. Later 273 heads would accept the LD4B or the newer Performer intake.