Holley or Thermoquad??

I ran thermal quads for over 20 years and I love that carburetor. but there's definitely a learning curve and you have to want to learn it. too many people slap one on their engine that doesn't run right and blame it on the carburetor, usually it's just poor adjustment that being said I have cleaned up 850 thermoquad big block version slapped it on a hot 340 and just tore up the street. There's a couple of things that a thermal quad does really well one is allow you to get good gas mileage if you stay out of the secondaries it's amazing. Second is it really does help keep the fuel cooler and avoid vapor locks and other problems associated with boiling fuel. As far as performance goes that will depend on your tuning ability .oh yes and one more thing the small primaries on the thermal quad make for great throttle response. Old Black magic.