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YOu can swap the heads, with out changing anything other than the intake manifold gaskets. Just bolting on the heads won't be much of a gain though. What are your overall performance objectives? Lots of folks here have built motors, and learned many learning curves!
 

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I have heard you can gain about 40 horsepower with that head swap alone. Im sure others have done it and will chime in soon.
 

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great upgrade, I did it to my 289 about a year ago. I could really feel the power on the freeway. Just make sure you get them rebuilt. you dont have to change anything, its a straight bolt on to your engine
 

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I swapped them onto my buddies 68 but I think he had a roller block because it didnt have the clutch zbar hole in the side of the block. I would imagine that you would have to check the pushrod difference if any. I have some gt40 pushrods if you ever need to compare em I'll send you one.
 

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you need to watch piston to valve clearance on a 85 ,86 5.0 other than that bolt them on!
 
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