I checked and you can use the factory studs on the driver's side. On the passenger's sidejust use bolts that have the correct threads and are 3/8" longer than the manifold thickness. You also have to put the front and back bolts (with thread sealer) into the manifold then lower it in place because there's no room to install the bolt after the manifold is in place. On my 69 Barracuda I had to also rotate the 90 degree oil filter adapter. Otherwise the 360 mag manifolds have a ton of room to hook up the exhaust. Just try and use mandrel bends in your pipes so you don't choke it down!!:burnout: PS - I also posted some pics of the driver's side so you can see how you need very tight radius bends to clear the torsion bar. I ordered a short piece of super tight mandrel bent 180 degree pipe to make this part of it. Treblig