i know it sounds stupid, but make sure the spark plug leads are in the correct place from the cap to the head. compare your engine to a pic or mates car.
did you do a compression test before they stopped at all?? coz when i built my engine my brother did a comp test, but didnt take out the 'ign' fuse. The leads earthed out and blew the coil in the dizzy, lucky i had a b18b coil, which i swapped and it worked fine.
check for water/oil around the spark plugs??
check your battery earths are solid... and if you moved the dizzy or changed the timing-centralise the dizzy and turn it over.