Slant 6 won’t start after 4 months

The slant 6 is sorta tough to get the distributor back in right. It's taken me two or three tries on occasion. Since it can install any direction, unlike a big or small block, all you have as a reference are the distributor gears and there are a lot of them, so it's easy to get it in wrong. What I would do is get the engine on TDC for #1 and try the distributor stab again. The rotor should be pointing to about the 5 o'clock position when installed correctly.