Ok, I'm home from work for the week now, and I remembered that I was going to find the part number for that wider pulley for the tensioner for you. Unfortunately I could not find the receipt for it, so I went digging through my parts stock in the garage and found the original box for it, which is where I had stashed the original pulley tensioner. It's a Dayco part number 89016, and it lists at Advance for $19.99 in my area. You have to put a washer behind the pulley to space it out a little bit, but it will make a huge difference in keeping your belt from popping off as it is mega wide. I noticed you are running a stock water pump pulley on your water pump. I know my Steeda underdrive water pump pulley was much wider, and gave better protection against belt slipping. Unfortunately, I went back to the stock water pump pulley because the Steeda one under drove the water pump too much, and made the car run hotter than I liked. You might also want to look into replacing that Romac balancer for a better balancer in the future. Ford SB engines should really have an elastomer balancer because it provides better harmonic protection. A good SFI Pioneer balancer will run you about $180, but it is identical to the stock balancer in length, so it will not require any spacers.
Buy Dayco No Slack Idler/Tensioner Pulley, Light Duty 89016 at Advance Auto Parts
Unfortunately I can't see the blower in any of your pics because they are all of the passenger side. I know the D1SC is mounted on the driver's side, but I didn't know it was on the same 6 rib belt which is unfortunate. I would try and eliminate the smog pump without an eliminator kit. I seriously doubt it will have any effect on belt tension. You have to reroute the belt so that it comes directly up from the bottom of the crank pulley to the altermator pulley passing the tensioner on the way. If anything, I believe it will give you more tension, because you will have a tighter wrap on the driver's side where it comes down from the water pump to the AC pulley.
Kurt