No start on rebuilt 360LA

dartfreak75 said

The only thing that would make it backfire out the carb is its firing with the intake valve open. So either the timing is way off or your valves are stuck open. If the msd is messing up the timing then a points dissy would solve it because you can just hot wire it and run the dissy and coil straight off the battery no msd box! Then you know your timing is straight off the dissy no msd in the equation.

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Too far advanced will pop out the carb...as well a non sealing intake valve or like you said.. firing with an open intake valve.
Some might think to much timing would just make it harder to crank, but not if it has low compression/low cranking . The pistons are decent but it could have 72 cc heads.
180 out is what I think too.
Tdc on the damper should have the rotor at no.6.
Let's see if it shows compression, compression test.