Starting Delay

[morethanstock66]

Specs:

SBC, new wiring harness, new ignition switch, new starter, new alternator, new plugs, new wires, new distributor/coil, fairly new carb (manual choke), new fuel tank, new fuel sending unit, new fuel filter, new fuel pump.

Problem:

Every time when I try to start the truck and the engine is cold to lukewarm, It takes a good 5-10 full seconds to turn over. I prime the carb, Depending on the temperature, I use the choke, The switch engages instantly, the starter sounds strong, the battery is fully charged, but it takes forever to turn over. I'm not flooding it or anything. Once it turns over, it runs perfectly, it just takes entirely too long with me leaning on the starter.

Does anyone have any insight on a possible reason?