Ben's correct, you need to keep the 230 rods with the 230 crank, and the 218 rods with the 218 crank. Pistons are the same. Make sure you use a forged steel truck crank, the passenger car cranks are cast iron.
I was able to match the larger exhaust valves for the early T207 218" six with ones for a 236" or 251" "Big" six, the smaller intakes I had to cut down from 230 valves by having the heads' diameter ground smaller then the angle recut. With todays internet, maybe someone has some NOS ones so the added work wouldn't be needed.
I think the mid series T211 218 might be the one that has the same valve sizes as the common 230.
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