Never understood why folks look down on a 318. If a 302 ford and 327 Chevy can make power why not a 318? Yes it has smaller heads (in most situations) Low compression (unless you got an early one) and probably has a 2 barrel intake and shitty exhaust manifolds (performance wise) but rebuild it and as said many time will make power, just at a higher RPM than the 340 and 360.
Put the 6 pack on, be happy, if its functional.