Carb Question

[kuch72]

Alright. I got a used Holley 1850 cleaned and rebuilt it. The truck started right up I've done a little timing work, I haven't yet done the whole timing procedure, verifying TDC and all that. But my issue now is that my vacuum secondaries aren't working. I used the paperclip trick and took the truck for a drive. Now this is on a stock '73 350, Is there a chance that the engine doesn't require enough air to open the secondaries? I guess I should buy a vacuum gauge and check the vacuum.

I'm also using an adapter from square bore to spreadbore, I know this isn't the best solution. Would it help to put on an aftermarket intake manifold? (edelbrock performer)

I do plan on either rebuilding this engine or building a separate engine and swapping it in. So i could just wait to get a new engine to buy an intake manifold.

Thanks for the help,
Nate