E-30 belt broke- -Advice

[Tdb1946@xxxxxxx]

I bought a 91 325i last week for daughter, it "needed work" but price was 
right.Was running rough, but at least ran. Previous owner had no maintenance 
records, had no idea when timing belt had been changed. Yeah, I know, but 
price was right.Day after purchase, I started car, pulled out of driveway, 
engine died and I pushed it back in. Would not start thereafter although I 
cranked it number of times.  I decided to trouble shoot by beginning with cam 
belt replacement first and testing functions,parts as I went. on removal of 
belt cover, I discovered a number of belt teeth missing, enough that turning 
crankshaft wouldn't turn cam, belt slipped on crank. Apparently rough running 
was due to belt slipping one or more teeth before it finally lost enough 
teeth to fail to turn camshaft at all?
Question- since car was running, even if rough, before belt finally broke 
while engine running at low RPM, backing out of driveway, is it likely that 
any damage was done to valves, pistons when the belt did "break" or slip out 
of time so much engine wouldn't start again.I assume pistons and valves could 
have made some contact, although at relatively low engine speed. Should I 
pull the head and check valves, pistons with head off, or just restore timing 
locations on cam and crank, replace belt and tensioner ( and water pump, 
etc.), adjust valves and see if it runs ok? Should I be able to see bent 
valves by looking at  cam/valve train with valve cover removed, or removal of 
head be necessary to assure no damage.
Thanks for advice, opinions, proceedure tips, even remonstrances.
Tom

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