The OnSemi MC34063 model you posted appears to be written for IsSpice4. See
http://www.intusoft.com/lit/IsSpice4.pdf for the user manual.
The line:
B5 5 0 V=~(v(9)&v(8))
is a IsSpice specific digital behavioural source, consisting of a NAND function - see page 176 (PDF page 186) of the user manual.
For LTspice, you could try simply replacing the ~ with ! but the thresholds wont be correct, so it may be preferable to rewrite the line replacing the B source with a LTspice A (special function) AND/NAND gate, with instance parameters:
Vhigh=3.5, Vlow=0.3, ref=1.5
to match the IsSpice default behaviour.
The easiest way to get the syntax correct is to place the A AND/NAND gate (lib\sym\Digital\and.asy) on a 'scratch' schematic, label its used pins with the model's numeric net names, and set its instance parameters, then View the SPICE Netlist to get a line that should be a 'drop in' replacement in the model:
A1 0 9 0 8 0 5 0 0 AND Vhigh=3.5, Vlow=0.3, ref=1.5
For lines like:
B4 6 0 V=v(2,90) > (v(vref,90) + v(voff,90)) ? 0 : v(vdd)
the IsSpice ternary (If-Then-Else) operator
condition ? true_val : false_val (see PDF page 189) can be directly translated to a LTspice if function:
if(condition, true_val, false_val) giving:
B4 6 0 V=if(v(2,90) >(v(vref,90)+v(voff,90)) , 0 , v(vdd))
It may well be worth drawing up a schematic for the model in LTspice one line at a time, checking the netlist after each one to create a subcircuit of the model to aid debugging it. If you add the circuit elements in the same sequence as the lines of the model, the component lines in the netlist will be in the same order. Unfortunately comments and .model statements will be moved to the end of the netlist irrespective of the entry order.