congratulations on adopting your new family member.
couple things different from my '78 are the carbs (mine has Mk II) and even the head looks different. the picture makes it look like the carbs point outward like the earlier bonnevilles, whereas mine come straight back and connect to the air box.
Other folks on here may know if 78 had some change over. all depends on the VIN number, I suppose.
new valve guides made a huge difference for me. mine came with boyer ignition added.
also, where the swingarm welds onto OIF, the weld cracked and leaked oil bad - until re-welded.
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