The intruder orbitals from the fp shell play important role in the structure of nuclei around the line of stability in the upper sd shell. Experimentally we have studied 35Cl, 30P, 36Cl, 37Ar and 34Cl in this mass region using the INGA setup. Large basis cross-shell shell model calculations have indicated the need for change of the sd – fp
energy gap for reliable reproduction of negative parity and high spin positive parity states. Indication of population of states of large deformation has been found in our data. Theoretical interpretation of these states has been discussed.