the top timing marks do mean
something. there's very,very,very good odds that when you properly time the engine,you'll end up with those timing marks so close,that it might be hard to tell that they're not quite lined up and usually the ip mark will just be off to the pass side ever so slightly.approx the width of a dimes thickness,as a general rule.with the lines,matching,you'll probably going to be within 4-6 degrees or so.
anywhere around there and you could run the engine for years without damage.these old gal's are not very fussy.iv set mine from a couple degrees below 8 and couple above and it doesn't change my fuel economy any.if anything iv noticed 6 or 7 BTDC spools the turbo quicker and it pulls easier.
with that said,do however rent Gary's meter.it's good to dial in and have any engine in proper tune.
edit;
oh that's interesting.i didn't know the factory turbo engines got their static timing marks tilted down to the side like that.
no matter however,as the turbo engines and the n/a engines both share the same 8 BTDC (plus or minus 2 degrees) just the same.reguarldless as to where they put a scribe on them.
so i guess this means i probably don't have eagle eyes after all and there is no top center mark? .......dang i would of enjoyed that nickname too.
........
lol yeah,though not a Chief,i am seriously a member of the Aroostook band of Micmacs though,Ken.