Willdoit, at the moment I have no explanation for your simulation result.
Check the characteristics of the parts used by the program from Linear Tech.
Perhaps they are lossy.
Obviously, the LC-circuit is a lowpass and the phase must start at 0 deg - contrary to your graph.
As mentioned before, my simulaltor (ORCAD/PSpice) works perfectly and presents correct results: Lowpass with heavy peaking around 160 kHz and a phase response between 0 deg and -180 deg.
Correction: peaking at 1.6 MHz
Added after 31 minutes:
Willdoit, do you know that the inductance in LTspice has a 1mohm series resistance as a default ?