Hard starting 360

Some engines are just different on cold starts. If the accelerator pump is working correctly, some engines take maybe 1 or 2 pumps of fuel before starting and others may take 3 to 5 pumps. And once running, if it starts running richer than at first, it's building up ice on the throttle blades. Turn engine off for a few minutes and let the heat melt off anything and all will be ok after that for engine to start heating up by then. The line going to distributor is only going to matter if it's ported or not for starting and isn't an issue as long as the ignition is strong, timing is in ballpark and the accelerator pump is squirting fuel to richen up initial start as everyone has already mentioned.