Straight E will have a 4 hook head and not a quick attach like later K and F. If you try to mount a quick attach head (like a 238 or 330 black corn head) you'll have to remove the top 2 hooks from the head then get the quick attach mounting plate/pipe from the top of the feeder house of a K and figure out how to mount it on an E. Older orange heads have implement style gathering chains. Black and maybe? later orange heads have roller style gathering chains. Orange heads have more gearboxes and are harder to work on I hear if you have a bearing go out. Black heads use more chains in the drive system.
I have an EIII 240 2 row wide head orange sitting around hear plus an E330 3 row narrow head as well. Both are four hook mount ups. I have a later FK330 orange head that's quick attach that has removable filler plates and movable hook locations plus removable filler plates to go on either a K or an F. All these head of mine are driven by a chain from the left side of the feeder house. Some E combines I though had a belt drive for the heads and I don't remember if it's left or right. That's also a consideration to get the right parts to drive the head from the combine.
Two row wide heads are usually pretty easy to find since few farm wide row corn. Two row narrow heads were never made as the combine would not fit between the rows without running down corn. In fact two row wide heads came with stock shields to lessen the damage to adjoining rows. 330 heads are harder to find. Also, with a straight E, a 330 head will be heavy and you might need some weight in the rear like filling the rear steer tires with fluid or mounting wheel weights.