Edelbrock setup for dual quad

Thanks, definitely better in 2nd vid. I have to try to "balance" the 2 throttles to get it to smooth out altho it still revs very high. Firing order checked 12 times lol.
Just tried again in dark, no arcing or sparking.
I have to make adapter for coil bracket, so I may pull distributor and adjust a tooth.
Dana67Dart said
That was much better.

The engine is cold maybe you need choke.

But again backfire through carb means you have fire in the intake to combust the fuel.

Any chance the firing order is off?

I assume you had the dist out to install the manifold.

I'm sure you know you can rotate the drive gear a tooth to reposition the dist.
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