Spark Plugs

Charrlie_S said
I like NGK. The particular plug depends on year of cyl head, and whether the engine is stock or modified, and usage.

So far as I can tell, no numbers, it appears to be a late 60's to early 70's block, previous owner had a rebuilt put in.
Stock as can be so far as I can tell except for the 3:55 gears out back and the 2.5" exhaust...……..