Well guys I think its not a dieseling issue anymore if the motor wont even turn over anymore, gathering from this qoute.
"Any ideas on what would keep my motor FROM turning over? i just finished my 383 build, finally pulled it outside to get its first burnout, and the car stalled at about 4000rpm"
I would try and turn the motor by hand manually with a socket on the harmonic balancer.
If you cant get it to turn over then you proabaly have some internal issues.
So pulling the motor would be manditory, and then some exploratory surgey.
Goodluck, Charles