Originally Posted by dtn8tr
What about the difference in the early to mid 80s head bolts sizes?
That is where it starts to get tricky. Also some valve covers will not swap over.
The head bolt size differences need researching if the OP is thinking of swapping heads.
I have long considered building a 258 using the old style fully counterweighted crankshaft. At almost 100 lbs stripped, it gives a very smooth idle and incredable low speed pulling without stalling.
But as to the original question, I thought external accessories were what was being swapped.