Hi Rene -
My first picture (handwritten) is how I had my Holley 4150 (List 4609, 735 CFM) set up during the initial phase of my ownership. The typed data is how the same carb is currently set up. It starts good, idles good, runs great.
I have drilled my throttle plates (you can see one of the holes in the picture). All four throttle plates are drilled.
I’m running a 358 ci (351C bored .040” over), a George Pence recommended Bullet cam. Compression is 10:1. I am also running the Blue Thunder manifold.
My buddy Wade helped me set this all up, drilled the throttle plates, and we eventually converted this carb to 4-corner idle by drilling, and installing needle valves in the secondary throttle plate.. nevertheless…
It seems to me if your car won’t even run on start up, and doesn’t idle when you open the secondaries all the way up, very small holes (.136”) in your throttle plates will not solve your problems.
I would be thinking about something like ignition timing. But that’s just me.
I hope this information is helpful to you.
Rocky
