+1
I've cut a new chain before to where the axle fit all the way forward... Big no..no... I believe this caused me to replace that chain after a few thousand miles due to possibly overtightening and improper slack specifications..
SEE LINKY
Thanks to the great folks in here, almost made the same mistake twice.
Use the same amount of links as the old chain. Also a VERY good idea to change both front and rear sprockets with a new chain as they wear and fit together.