Editing My 84 mustang cranks and idles fine but when put in drive it dies 302 engine built, carb, accel ignition. please help

my 84 mustang cranks and idles fine but when put in drive it dies. 302 built-up, carb, accel ignition run great when baught but set for 1 year and several different people messed with the carb and destribador. please help

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