Trick Flow 270s are available as well. Max Wedge ports!https://www.summitracing.com/parts/tfs-6161t784-c01
I did studs, but beware that any exhaust headers will need to be modified to fit with head studs. The lower studs will hit the header flanges. Not sure about stock exhaust manifolds, but TTi and Doug's both had to be modified (grinding the flanges).