just did a ls1 rear swap on my 84 z28, it looks like the driver side tire is sticking out maybe 1/4 inch more than the passenger side... will a panhard bar fix this? do i need single or double adjustable?

 

single adjustable is fine. did you lower the car when doing the swap (ie lowering springs)? In theory shouldn't have changed unless you lowered the car, but anything is possible. did you remember to install the rubber spring isolators on top of the springs? if you used the 4th gen isolators that would have lowered it a bit from what I read maybe.

 

the car was already lowered before the swap but now with the ls1 rear and 245 tires the driver side sticks out past the body of the car not even half inch but the passenger side is almost even so i only need a 1/4 adjustment to even it out...

 

You'll be fine with a single adjustable end I'm sure. I've been running an Edelbrock one on my car now 4 years with no issues. Maybe a pricier brand or double ended job is better for the strip or autocross or something (I'm not a racer), but the less expensive Edelbrock has been fine for me on my street car.

 

ok, so will the panhard bar be able too push the rear over?

 

Yes - an adjustable one will - you just adjust it centered, tighten the nut, and done. It's real easy to adjust, you can do it with the car on the ground.