87 non turbo drove then died now no spark

[newtosupras]

so i jus swaped my motor out for another one ran fine was driving it 2 days later and it jus dies had it towed home i checked it and theres no spark i changed the igniter still no spark i changed the coil still no spark i changed the distributor still no spark i checked the timeing belt its good i checked the wireing with ome meter and it check out ok checked all fuses there all fine im really at a loss here and about out of money any ideas what could be wrong?????