which spark plugs?

[91whiteponygt]

i have edelbrock performer heads which plugs should i use and which heat range should i use??? car has gt 40 upper and lower intake, b- 303 cam 65mm throttle body and mass air. shortie headers, do i need to upgrade from 19 to 24 injectors, car seems to be running lean as it likes to run a little warm

 

[Mike92GT]

Either Autolite 3925 or 3924. The 3924 is one heat range colder than stock. I think 24lb injectors would be a good idea with your combo