To much GAS

Do you know how to tune a Holley or any carb? You need some tools to help do so or you're pretty much wasting time..

Before doing any tuning I would seriously consider a fuel pressure regulator with a pressure gauge after the reg, but before he carb - Holley's don't need more than 7psi and if it's getting more it could be over filling the bowls and dumping fuel out the boosters (been there)- could also reset the floats as well - there is a Holley video on youtube on how to redo that..

Timing light
Screw drivers for setting idle mixture, idle speed
Vacuum gauge
Carb jet assortment
Pump cam, and squirter assortment (Holley)
Extra bowl/metering plate gaskets
Secondary plates to adjust secondary jetting (4160 style carbs)
extra carb base gaskets - I reuse them twice and toss them.. had my carb off MANY times
Cheat and splurge on a AEM wide band A/F gauge kit (I tuned a single Holley in 2 hours in my driveway with a couple blasts up and down my road But I had dumped $120 or so into extra parts for tuning.. plus $200 for the wide band)

Be sure the vacuum advance if it has one is hooked to ported vacuum and not manifold vacuum

Tune the primary carb first (usually the front one on dual carb set ups) - document what the setup is at right now so you have a base to go off of - wright down the jetting and the plate

base tune is -

Set timing to stock (10-12* BTDC or so OR 32-34*@ 2,000-2,500rpm total if you do it that way)

Set idle speed as low as possible (750-800)

Hook vacuum gauge up to manifold vacuum source - all idle mixture screws 1.5 turns from seated (gently seat the screw and turn out 1.5 turns) try to get the highest reading you can turning both screws the same amount (I go 1/8 -1/4 turn at a time in either direction but some say go a 1/2 at a time) - turning out adds fuel turning in takes fuel out..

Tune from there.. I strongly suggest getting the wide band for a DIY'er you don't need to mount it in the car - I didn't just made a harness with a on/off switch and had a passenger hold the gauge and watched what it did - also do not spin the tires while driving it as it will hide flaws in the tune.. do not stomp the gas either easy into it so you can feel/see a hicup in the tune