While I think my current carb (Grant 650 Speed Demon w/Mechanical Secondaries) is fine for racing, it seems to make the Dart Iron-Eagle 363 Stroker (Siamese Bore) Engine in my 66 very cold natured & not "street friendly". Since I no longer race, I'd like to swap to an Edelbrock Performer 600 Electric Choke or the new Thunder 650 cfm. My 66's engine is set up for torque rather than high rpm (Perfomer heads & intake vs. Performer RPM) with Torque Grind Roller Cam. I'd appreciate any thoughts from those who have run either carb on a performance (torque vs rpm) engine above 351 ci as to their ease of starting/idle/street manners & not leaning out below 5,000 rpms.