Worked on this beast most of the day. Got the tailpipe sections cut, welded and the hangers installed. This kit gives you way more tubing length than you need, like 50% more. Cutting and reinstalling is tedious, especially cutting on angled sections. You have to sneak up on it. Sometimes cutting a few inches doesn't only shorten it but raise/lower it at the same time.
Pulled everything out after mockup and tack welding for final welding. Put the manifolds back in with gaskets and then spent and hour trying to get the y-pipe to line up with the manifolds collector flange. WTF! It was 1/4" off and I couldn't muscle it enough to get the bolts in. Then I had an epiphany. I built the y-pipe without the exhaust manifold gaskets installed! Loosened the manifolds and removed the gaskets. Bingo, it lines up. Reinstalled the gaskets and tightened it down. LESSON learned. Each gasket is a heavy 1/8" thick. That spread the collector width 1/4", this being the issue.
I offer a value tip for anyone contemplating installing these manifolds. Take a 2-3 inch 3/8-16 bolt and cut the head off. Then slot the end of the bolt so you can turn it with a flat screwdriver. Screw it into one of the center holes on the head.
When you lower the manifold into place, slip it over the bolt. Then you can get the other bolts started. These are HEAVY! Trying to hold it in place with one hand is virtually impossible. I'll have this wrapped up and fired up tommorow. Thanks for looking.