Truck is Backfiring after Distributor rebuild

[SgtSunbutt]

I replaced the Distributor on my 1981 Chevy C10 Custom deluxe 250 L6, and then re-timed it as per requirement of doing those sorts of things, It fires now, which is more then before, but it now just cranks and cranks, and sometimes Backfires, I even had a mechanic friend help me time it using the timing marks. Any Suggestions as to what could be wrong? Could it be the Carb?

 

[Georgeb]

I have to ask. Did you and your friend use a timing light? Are you sure the wires are on correctly in the right order?

 

[Jrgunn5150]

Could be 180 out if it's not firing.

 

[Georgeb]

Could be 180 out if it's not firing.

That was my thought too.

 

[Jrgunn5150]

That was my thought too.

Yeah, usually they'll run if the timing is pretty badly off, but 180 out usually get's you nowhere.