Some are giving you some heat and yanking your double row chain...MrHill wrote:I couldn't get it in. The tensioner wouldn't budge. Even loosened

First, are you really, really, sure the t-belt is in good condition?
Have you studied some of the really good write up on blet replacement?
I would not recommend changing the tensioner setting(meaning don't loosen the bolts) but if you must there are two. However even if you loosen both the pivot and locking this won't necessarily help you because the spring will push the tensioner back out against the belt and you are still fighting the spring to get the pump back in proper place.
Are you sure you can't place the spring fully up into the tensioner pin, locate the spring in the pump recess, then leverage the pump into place and place a bolt to hold it while getting all the other bolts in? I have done that once before when a pump failed on me not long after a belt change.
If you must, must loosen the tensioner you have to be sure nothing rotates. Keep some tension on the belt as you take it off and over the tensioner. It's not advised though. Then remove the tensioner, put the new WP in place, replace and compress the tensioner and tighten only the lock screw so you have enough slack to re-install the belt, loosen the lockscrew, rotate the engine with crank nut a minimum of four or more full revolutions, tighten the tensioner lock screw then pivot bolt, then proceed with the rest of front end re-installation.
I don't reccoment this but I don't believe that re-tensioning a belt like this will result in sudden and soon failure. These belts don't "stretch" and re-tensioning should not hurt at all. It's not needed but the spring does not have enough force to hurt anything either.
If the belt has been nicked or damaged in ANY way during this process then you should replace it though and do the whole thing.
If you goal is to keep this car 'forever' then replace the belt and do it all right from scratch. If your goal is to get it running again and you have your sights on something else down the road then proceed.