Bad starts when warm...heat soak? Carb?

[Buzzman]

Hey there,
(350 with Edelbrock intake and original 4bbl Q-jet)
Having some issues starting when the motor's nice and warm. For instance, when driving around all day, running errands, if I stop for 15 minutes somehwere and come out, the truck has a hard time starting. It turns over, but I have to give it some gas to get going. In the morning, or after sitting for a while (hour-plus), it fires right up.
I've done a little research and it seems that it might be starter heat-soak, as the exhaust downpipe does run pretty close (ramhorns). A mini starter/heat shield might fix this. The other possiblity would be something with the carb - it almost feels as if it's flooded, or the gas is getting too hot from the intake -some folks have mentioned a carb spacer to help with this.
Anyhoo, sorry for the long post. Any tips? Thanks.