Starting Problem

[CUBaseball]

My brother-in-law's 69 C-10 has been having a problem starting and he wanted me to post a question. He just performed a full tune-up but has had a problem cold starting the truck. It will compression start easily and run great, and start easily when warm, but will just crank and crank when cold. He has fairly new edelbrock 1406 on a goodwrench 350 and was wondering if the 1406 might have a fuel bowl issue that is affecting air/fuel mixture on a cold startup. Everything else (electrical, timing, ect.) have been checked but he does know carbs as well as he wants. Any advice will be appreciated.