71 340 Compression Test

Prior to pulling the bone stock 340 out of my 67 Barracuda Fastback I ran a dry (no oil squirted in cyl) compression test on the engine with all plugs removed. Range was between 150-164 lbs which is about 8.5% difference. My question is what is considered normal?
This is a mid year 1971 motor by the dates on the block and intake. I am trying to decide whether to go rebuild the engine or not? Not going to drag race the car. Going to car shows and cruises etc. Might take it to track for a couple of passes to just see what it might do. Plan on going to Edlebrock Performer Air Gap intake, Holley 770 Street Avanger, headers with 270 or 280H Comp cam . This is a 4spd car with 489 rearend.

Appreciate any thoughts ideas. Spoke to one speed shop near me and cost would be near $8,300.00 if they did the rebuild.

Thanks