Recurring Crate 350 Gremlins

[73kay]

Hey Guys,

Here is what I got:
76 c10 w/ Saginaw 3 OTT
stock goodwrench 350 260hp less than 1500 miles on it
mech fuel pump w/ reg on it @ 5.5psi
edelbrock 1406 600cfm carb w/ electric choke
generic HEI dizzy w/ vac advance
E3 Sparkplugs, gotta check the gap, but remember they were good for hei
Init Timing currently: 12BTDC

Issue:

If I floor it or give it too much gas on the road/up a hill/etc I can feel/hear pinging. I have been chasing this for months off and on, so here is what I have done:

1. Verify TDC w/ valve cover off and it matches harmonic balancer
2. Set initial timing to 14 but I have been all over the place to see if I get a difference and I can't.
3. Set Idle screws - while maybe unrelated, my pass idle screw doesn't change the engine at all and might be stripped it feels like.
4. Check sparkplugs and they look good/normal condition
5. Added a fuel pressure regulator
6. Getting ready to replace the damn dizzy bc that's the only system I haven't replaced.


I can only thing that maybe the dizzy springs aren't right and the vacumn advance is off somehow.

Appreciate any feedback. Its a stock crate 350 and I really am not looking for anything crazy just good power w/ economy. I usually run straight 6's so this is my "big block" haha