Ford v6 carburated engine, pointless dist, ign module. eliminated key to a toggle and pushbutton but wont start when cranking over but as soon as let off button it will fire. voltage drop when cranking gets below 10. that seems to be to low to fire ign. module. any advice?

Did you just hook this up or was it working before? First batt voltage should not drop below 9.6v under load/cranking, second thing comes too mind is if your running a ballast resistor and where you have pos. wire for point less ignition-before or after ballast resistor alot of pointless ignitions want you to get the power before resistor so the ignition module has enough voltage to work with. also you can check voltage at coil during cranking to see- you need to be above about 7 volts or so. Also little known fact, if you have stater sol. on firewall/fender and you have second small terminal labeled "I" if you connect this directly to coil pos. it will apply full batt to coil during start only-by passing resistor.

Either weak battery, corroded cables, or hi starter draw.