If it runs well, you didn't bend anything, and if the timing marks are in line, the chain is perfect.
Your rough idle is another problem. Start with looking for a vac leak, certainly, but don't ignore the secondary ignition system -- bad plugs, wires, cap, or rotor will give a rough idle.
So can a bad engine mount, by the way, check those too. If you have the spherical gell filled ones, if the rim is less than about 3/4" from the frame, you cannot see the tapered portion on the bottom, or you find sticky goo on it, it's shot.
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!