Mike,
I have a 1970 FORD pick-up truck with a 360 engine. Which have served me faithfully for years; all at once trouble started. We tried desperately to start the engine, but with no luck. After using all mechanical skill I had, I gave up. So I decided to check the compression in the cylinders and found that the compressions was around 80-90 lbs....my question is ...will this low compression keep the engine from starting?...I've put in new plugs, new wiring,new coil and condenser and the bad boy still will not start. what's wrong?

You don't state if you have fire at the plugs and if you have fuel at the carb. Your compression is low and indicates that your rings are worn out. There is a chance that due to all the miles your timing chain has worn out and jumped a tooth this would cause low compression and no start. You compression when the engine is warmed up will be higher and more accurate.

Mike