Hey guys it's been a while since I have been on here.I just moved from where we were living to a house with a garage for my 63 c-10 half ton truck.It has a 283 2 barrel in it.I took it to a old mechanic that was his specialty in his day.He put sleeves in the plug holes cause the plugs were fouling out it run 100% better so maybe that may help you guys out if it runs rough or missing a lot. see ya.