Carburetor Question - Is this a good call?

Hey, YR, just to be clear for the OP, isn't a NGK GR4 plug already fairly hot??? (yeah, I hate NGK #'s too!) Doesn't seem like it would cross to a Champion 11, but these plug numbers scramble my brain. And I agree about the platinum plugs!!!! I had a 440 with stock Mopar ignition that I could never get running right until I finally pulled the new-ish platinum plugs and replaced them!!!

If this helps anyone:
"NGK plugs are colder the higher the number, hotter the lower the number. Starting with part # BKR6E-11 (heat range 6), a colder plug would # BKR7E-11 (heat range 7), a hotter plug would be # BKR5E-11 (heat range 5). For NGK Racing Plugs, the heat range is located AFTER the hyphen."

"NGK GR5 (one step colder than GR4)"



Yeah, it's fairly warm. I'd keep an eye on them once the OP gets the carb/spacer sorted out.