I believe the Weber versions of this carb uses the same jets as the H/W (may want to ask Tom about that). Search the internet for Weber carbs and ask around, several dealers around, I've seen high dollar kits for Jeeps etc. Also you can drill out your H/W jets. I'll have to check my files to see what size I used on my 261 dual set up. Send me a private message and I'll get back to you later.

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed