After yesterday when I rebuilt the carb and finally have it running good one of the spark plugs were not firing at first a good 4k rev cleared that up, Today I wanna service my 86 mason dump 351w what spark plugs should I run and would new spark plug wires be needed or not?

 

I alway go for the Motorcraft Copper plugs. Wires are a good idea if they haven't been replaced in a long time. Old wires usually last a long time until you go messing with them. (To replace plugs, cap, etc)

 

the plugs should be ASF 32-C 42 if you want a hotter burn

 

I use Autolite 24. If you're burning a little oil, use 25.

 

NGK UR5's is what I used in my 86 351W. Great sparkplugs. They only cost me $2.49? a plug.