454 hard to start

[MrDerek]

Hello all. Hope ya'll had a great Thanksgiving. Well im still building on my 70 Chevelle. I have a recently rebuilt 454 (bored .40)motor in it. This motor takes forever to warmup! If my foot is not constantly on the gas for about 5-7 it will cut off immediately. After that it idles fine. From what I've been told this is a common problem for big blocks but no one can seem to give me a sensible answer on how to cure it. I have a 600cfm Holley on top. Any advice would be very helpful.