Running 3 Weber DCOE 45 #152 carbs on a 301 Chev 6. Motor has a huge stumble off the line. Are the .45mm pump jets in a factory rebuild to large? What size have you had success with?

Can you tell us more about the engine?
Compression
Cam
Headwork
Ect

Compression is 12.33. Cam is a Cam Techniques, .626/.633 lift, 252/256 duration. Head is a lump port from Mrhotrod6 Motorsports/Twisted6

Need to know if it stumbles like almost dying from not enough fuel,or stumbles from too much fuel,black smoke coming out of the exhaust?

If you can get in touch w/Mike Kirby,he could tell you approx what size emultion (SP) tubes,etc you should start out with.

MBHD

Richard E. Peterson
You can also get in touch with mrhotrod6 He knows these webers inside and out.He runs them in both his record setting Race cars.
And no dout get you dial in.