Holley 750 Street Demon isn't that expensive and will probably get as good mileage as any other carb, will bolt onto your Performer. It's the latest design out there and appears to have taken some of the Thermoquad's design advantages and modernized them. It'd be my choice for a daily driver.

The Edelbrock 750 is a love or hate carb. AndyF has had very good luck with the Edelbrock 800s, both AFB and AVS, although if I was buying one it's be the AVS Thunder series.

R.