As Panic mentioned, the bowl and airhorn are zinc alloy, about 18 cents a pound around here. Check with your local recycling center.

The throttle bodies are cast iron. The single barrel throttle bodies can be placed in a power hacksaw to cut off the flange just below the throttle shaft. Then two of these can be welded together to make cross-adapters for various uses.

Give some serious thought before scrapping Rochester two-barrels or four-barrels, unless they are absolute junk.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop