74 Duster (318) cranks, but no start. Need help.

See post 2 here for a diagnostic
Not getting 12 volts to coil

Then get one of those spark checkers that plug into the spark plug wire. (Yea there are other ways but its like $5, safe and easy to use without a helper)

if its getting half decent spark then its probably timing.

remember theres only three things needed: compression, fuel, spark. if the spark timing is too far off then there isn't compression.