Plug recomendation for my sbc vette

Need some help on finding the correct plugs for my vette
Its a l-82 1973 stick nothing fancy, performer intake, pertrnix ignitor 2 convertion on the stock dizzy
And msd 6al box
I'm actually runing ngk bpr6fs, they look tan but they seem to have little gap imo
I really don't know if those are the correct plugs for this set up

got all the polution *************** still on it Kap? air pump etc....

On a vett I would run AC's and nothing else. Can't advise on the number.
With the 6al you should should open them up to 70-80 thousanths.

I'd say you have some serious timing and/or carburation issues to get that bad for milage.

Guys why tune their panteras right can get 20+ on highway cruise, you should be able to also, especially with the stick.

Perhaps explain your carburation and distributor setups.

Map your ignition curve w/o vacuum advance conected every 500 rpm.

Connect a vacuum gauge and report typical vacuum at idle and at highway cruise.

report any major engine changes like higher compression pistons, heads, wild cam, etc.

If you do have a holley, I can forward some really good tuning information.

AC MR43LTS is the correct plug labeling I am pretty sure (pulling from memory)

the original gap should have been .035, but with the high energy ignition your running I would gap at .040 as a starting point and go up in approximately .005 increments after driving a hundred miles or so and read the plugs to see what they are telling you. I found that .045 worked well for me when I quit running points in my Nova and put in an HEI dist. My base timing that the car liked was 12deg BTDC at 600RPM in gear and total timing right at 35deg. - vacuum advance was the hardest thing for me to tweak, but if memory serves me correct the advance at idle with vacuum hooked up would be around 26deg. and gave the best economy for daily driving. I wasn't running the L-82, but it was a SBC 350 gen. 1 with slightly larger carb and upgraded intake and no EGR. I got 13-14mpg if I drove casual and kept it under 60mph to hold the RPMs down. Nice thing is you don't need a computer to work on it - just a log of what changes you do so you don't forget every few days.

Good luck