check and see if gas is squirting in the carb when you push the throttle linkage.
if so,
Check a plug to see if you got fire.
if so,
you got a timing issue.
easiest thing in the world is crossing wires, or putting in a distributor 180 degree out or some where less.
gas, fire, and timing is 99% of the time where the issue lies. lesser is combustion, broke cam, broke crank, etc etc. all of which I have had.
obtw if you suspect gas, a little starter fluid with tell you, not too much though.
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2003 Marauder BLACK
SS inserts
Addco sway bars
JLT CAI
4.10's
MO's custom tune
275 rwhp/303 lbs. torque