Why isn't my teleport script working, and is there any better methods of teleporting bricks?

I'm not sure what the wait() functions are for as they seem purposeless for what you're trying to do, but you probably either want to use a for loop or TweenService if you're trying to get it to fluidly move into a position rather than an abrupt teleport.

Depending on the object (such as a character), it is better to use CFrame, but changing something's position or orientation will suffice in general situations.

I'm not sure exactly what you're trying to do, but I would check out the earlier links I post above if you want to do some kind of movement. The way I would rewrite the current code you have to be more efficient would be as followed:

--// SETTINGS //--

local dump_pos = Vector3.new(37.65, 2.626, 7.11);
local base_pos = Vector3.new(50.128, 4.991, -19.182);

--// VARS //--

local darts = game.Workspace:WaitForChild("darts");
local part_2 = darts:WaitForChild("p2");

local a,b = part_2:WaitForChild("a"), part_2:WaitForChild("b");

--// CHANGE POS //--

wait(3);

script.Parent.Position = dump_pos;

wait(3);

a.Position = base_pos;
b.Position = Vector3.new(base_pos.X, base_pos.Y+ 0.009, base_pos.Z);

If this wasn't what you were looking for, then I apologize, as I didn't really understand the question. I hope it helped in some way though :)