Slant won't start!!?!!?!?

Great luck. I still don't think a cracked or warped head could have affected 3 cylinders on opposite ends. With the readings you have now it should idle OK. I assume you removed the spark plug tubes and used a screw-in compression gage. If not, you may not be getting valid readings.

Try closing the choke slightly and see if it runs smoother. If so, it is idling lean (common problem). Even better, try spraying starter fluid down the throat while idling. Insure >8 V from coil+ to BATT-. If not, wiring issues. If still running points, you could convert to HEI ignition cheap since you aren't afraid of junkyards. Read posts.