What is the best Gunks-like climbing out West? My own criteria is only that it "feels like Gunks climbing" and is mostly horizontal strata. My suggestions:

Unita Rocks: east of salt Lake, horizontal strata and overhangs, trad and bolts, high elevation.

Owens Gorge: eastside of Sierra, buckets and bolts.

Isolation Canyon: east of Flagstaff, mini-buckets, trad and bolts.

Skaha: British Columbia, nice weather, trad and bolts, lots of edges.

Maple Canyon: south of Salt Lake, all bolts, all cobbles, but the handhold intensive climbing is not unfamiliar to Gunks climbing.

Blackleaf Canyon: central Montana, limestone but with horiontal edges, mostly bolts.

I liked all of these areas. There's probably other canidates. What area out West feels most Gunks-like to you?

Lovers Leap CA is famous for the small horizontal dikes.

But the dikes are positive i.e protrude rather than being slots/gunks-horizontals.
That said, Fantasia is just stellar.

I forgot about Lover's Leap. Some of the classics there do have thar Gunks feel. Great place, the best dike climbing around.

Tamo? I haven't been there. But I like quartzite. Isolation Canyon is Gunks-like quartzite. But I hear the access into Tamo isn't easy.

I've heard Red Rocks described as "gunks with texture", which seems about right. I'm surprised no one mention Devils Lake.

Some of the short sport routes, and long ones too, ar Red Rocks have Gunks-like climbing. But in general Red Rocks does not "feel" like Gunks climbing to me. Perhaps because it seems more like face climbing, even though the holds are crisp, than horizontal strata. But I haven't climbed a lot there. Too hot.
Devil's Lake IS Gunks climbing but I don't consider it "out West". Likewise Arkansas climbing (which I'm dying to try) might be a good match but is not really West either.

You've been picking the wrong times to go.

red rocks, owens and the leap? really?

I was thinking the same thing. Red Rocks? Definitely no. Owens??? Nothing could be further from Gunks style climbing.
Can't comment on the Leap; never climbed there.