Years ago I needed the diaghram housings and I ordered them right form Holley. I have used Chicago Carbuerator for some small parts in the past. Never had an issue, but its was only a few orders.

68 Road Runner (383/4speed, post car w/decor pkg) - Major Project
69 Road Runner w/472 Hemi & 4 speed.
70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project
2023 Ford Mach 1