How tight is correct for the timing chain?

There's no manual that I know of that's ever printed that dot to dot is 180* out. You can do one of two things. Get a 12" ruler and line the cam gear up at 12 o'clock and crank gear at 12 o'clock, OR simply line the dots up together and drop the distributor in at #6. The latter is what I do.......AFTER of course degreeing the cam. If you are replacing the timing set, the camshaft will have to be degreed again. As stated, if you want stable cam timing for a long time, don't skimp. A timing set under 100 dollars is skimping. I like the Comp billet sets. The last one I bought was 110 dollars and it was for a big Chevy. If you do decide to skimp on the timing set, advance the cam even a few extra degrees ahead of where the cam card says, because it will be stretch after 5 minutes of run time.