Also, Langdon's has the adaptors to allow the H/W progressive 2 barrels to bolt on. Check out his web site, ad runs on this site. Also I believe those little adaptors are an aftermarket item for Jeeps etc. Check out some Jeep parts dealers online.
I just sold an Offy 3x1 intake that had cast iron Weiand adaptors for the bolt on trick.
Just search online for carb adaptors, I found several.
