So it seems like I should try a *colder* plug than what I have now which is Champion*Single Platinum #3983*- Heat Range 12 - tapered seat.

In doing a bit of research it looks like I could go with the Champion*#3346, which is also a single platinum plug but with a Heat Range of 10 and it is gasketed seat vs. tapered seat and has a projected tip - not sure what effect the seat and tip have.

I could go with traditional plugs too, more options there it seems...

Also Resistor Core plugs are available, not sure if that would be applicable to my build, which is as follows:
-350 SBC, 9:1 compression
-Cam: 214/224 duration (280/290 adv) with .443/.465 lift @50
-GM Cast Iron Vortec Heads
-Edelbrock Performer RPM Air Gap Intake
-600 CFM Carb (mine is a Carter AFB)
-corvette exhaust manifolds

Looking for spark plug recommendations and suggestions please! I like to keep it low tech on things like this, $1.49 plugs you can get anywhere are much preferred to $50 a pair gucci plugs