Right Cylinder Heads For A 225?

Well it always gets a little more interesting with every turn of the wrench. Pulled the cylinder heads off a 69 Jeep CJ5 with a 225 Oddfire V6. Looked at casting to replace the heads and per the great document downloaded and attached. I haven't looked at the block to see if it's 231 or 225 (was told a 225) Cylinder heads stamps reading B-1257051 Found a pair for a 78 Skylark that match up. Question is there anything I need to be aware of for matching the cylinder heads? I will find a gasket kit somewhere. Anything else I need to purchase? I live in Mexico, and really not a local AutoZone or even big shipping. Friends coming down and will handle the swap. Apprecaite the advice as per usual. Salud here, it looks like the engine is a 78,