Sticking with the D is fine. You must use new cam followers with it. Run the engine for 20 - 30 minutes at 2000rpm at the first startup to bed in the cam and followers. Heavily coat the cam lobes and cam follower faces with cam lube when fitting. Change oil after this first run and then run in the whole engine for about 500 miles before changing the oil again. New filters too. You can retorque the head bolts after the initial running. Loosen bolts a fraction and then re-torque. Rocker gear will have to come off to do this unless you have a crows foot spanner to do the hidden central bolt. With that, you have to compensate for the extra length so rockers off is easier. Reset valve gaps after final torquing.
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