They're numbered 1173, 1288 (those two in the Four-Color numbering), then 01-860-207, and 12-860-210. The fourth issue is misnumbered 01-860-210 in the indicia. 01 stands for fifteen cents and 12 for twelve cents; the price on Dells had just dropped back to the industry standard at this point.
George Evans has said that he and Reed Crandall sometimes swapped some pencilling and inking on a story, but here I'm listing the artist I see doing the most on pencils or inks. Hearing that Frank Frazetta inked Evans on the fourth issue, I give him the credit on the stories that look least like Evans' own inks. On "Hard-Luck Harvey," Joe Giella, not known to have worked at Western, is a wild guess on my part; but does this give anyone a feeling of Fifties Strange Adventures/Mystery in Space déjà vu?
The second issue cover painting is by George Wilson. Someone else did the first; and another artist did, I believe, both the third and fourth issue paintings.
The Twilight Zone at Dell—Written by Leo Dorfman
|Mar-May/61||(#1)||Specter of Youth||p: Reed Crandall i: George Evans|
|The Phantom Lighthouse||a: Crandall|
|Doom by Prediction||a: Crandall|
|Feb-Apr/62||(#2)||The Bridegroom||a: Evans|
|Secret Weapon||a: Evans|
|The Joiner||p: Crandall i: Evans|
|May-July/62||(#3)||The Man from Nowhere||p: Mike Sekowsky i: Frank Giacoia|
|Beyond the Window||p: Sekowsky i: Giacoia|
|Hard-Luck Harvey||p: Joe Giella i: Giacoia|
|Aug-Oct/62||(#4)||The Ring||p: Evans i: Frank Frazetta|
|The Collector||p: Evans i: Frazetta|
|The Time Machine||a: Evans|
Just possibly the fillers (1-pagers except for "Voices" in the second issue, a 2-pager), are by Dorfman, but they're more illustrated text than comics (no dialogue), which makes the style harder to pin down. I believe some issues here, on variants I haven't seen, have additional filler pages in place of back-cover ads.
The Twilight Zone Fillers at Dell—By an Unknown Writer
|Mar-May/61||(#1)||Journey into the Twilight Zone||a: Evans|
|Feb-Apr/62||(#2)||Voices from the Twilight Zone||a: Evans|
|Voyage into the Twilight Zone||a: Evans|
|Calling the Twilight Zone||a: Evans|
|May-July/62||(#3)||Luck in the Twilight Zone||p Sekowsky i: Giacoia?|
|Lost in the Twilight Zone||p Sekowsky i: Giacoia?|
|Aug-Oct/62||(#4)||Creatures from the Twilight Zone||a: Evans|