Start by setting the timing. Make sure it's right before you waste a lot of time on a non-problem.
Next, examine the distributor cap. You shouldn't see any cracks or black "spark traces" anywhere on the inside of the cap. It should be clean, no moisture.
If that's not the cause, check the carburetor's accelerator pump. If that's not functioning right you can get some backfiring.
Check the compression. Sometimes a sticky intake valve can cause trouble.
there is no carb on that truck
probably 180 deg out on timing
That 87 truck already has a carburetor on it.
Rochester Quadrajet.
its in the carb
in the carb inlet
adjust the chock if it has carb.
timing advanced, 180 out, Chevy requires delayed vacuum for advance, did you change the vacuum supply location? firing order 18436572 clockwise on distributer, turning distributer counterclock wise advances timing,
if it is back firing out of the carb, and wont completley turn over then you may have a head gaskett problem shaunna 586 738 1782
It's lean. Best to check the carb and all vacuum lines for leaks and blockage.
Unburned fuel in the pipes. Your running a little rich, or, maybe the float level is a little high in the carb.
Yep.