I purchased the Holley Sniper, 550-552 from Summit Racing Equipment.
My no-brother-good in-law, who is an excellent fabricator made the adapter. He took a piece of 1 5/8” 4130 tubing and turned the ends down to 1 1/2” and then TIG welded 1 1/2” exhaust pipe flanges onto the turned down ends. I can get you the vendor and P/N of the exhaust flanges if your interested.
Thank you for the compliment.
Put a few more miles on the truck today. Starting and throttle response have made the project worthwhile for me.
Dan
35 CC Case 38 Chevy Pickup 51 3100 AD 58 3100 Apache Fleetside