No start after intake and carb swap. Stumped

Was the TQ rebuilt? The o rings are often omitted by mistake & you get a very rich idle.
If the carb has sat unused for a long time, the o rings will go hard...& leak.

Get some new, fuel resistant o rings 3/8" or 7/16" OD, 1/16" wall thickness & fit them if the above criteria fits. You do NOT need the special Carter o rings. If you are careful with disassembly, you will NOT need new gaskets.