well i got my 383 in and had the computer tuned for 30lb injectors cause the injectors that came with my motor had accel injectors with 30 stamped on one side so i figured they were 30 lb injectors but after my engine running really rough and i finally pulled a few plugs out they were all black so my engine is running way rich im thinking. lol. so am i wrong on guessing the injector size (dont know if it matters or not but they are yellow topped) and also im running bosch single platinum plugs since thats all they had but my dad mentioned i might need a hotter plug. any ideas?

 

also any suggestion on spark plugs? not quite sure what compression im running but if it helps they are stock ported heads with srp 16cc inverted dome pistons.