If the block and heads are not milled or decked it will be about 9.8:1 and running @160 degrees like any other correctly setup car and 93 octane it should not ping unless you have a very aggressive timing curve (race) a Summit Racing 2801 (very close to 068 size but more lift and better midrange)272/282 .442"/.465" 214/
[email protected]" 112 cam is excellent for any 400 street/strip car with stock parts and with the HO 2-1/2" manifolds X-pipe Duals and Stock 68 intake (block heat risers) it will pull good up to about 5700 shifts but start/run/cruise like a stocker with good economy. Use a fuel pump for a 70's A/C application with the larger body. Open Element GM style 14" air cleaner (67-68 HO 400).
Try to upgrade torque converter with at least a 2200 or 2400-2600 for some punch off the line. This setup should yield 13 sec ET's in most mid-weight Pontiacs.