I think the ZL1 Aluminum 427 equipped Camaro was the fastest factory produced/factory equipped & also street legal HT/Coupe, with street tires & closed exhaust, the 427 Cobra was 0-100 & back to 0 in 10 seconds, hands down probably the fastest production car in the mid-late 60's, the Race Hemi cars were for non-hwy use only but, many of them made there way to the streets with license plates, street tires etc., The Mr.Norms Dart 440 GTSS were also very quick very low 13's or very high 12's... The 66 Chevy II 350hp 327 L79, was also right there @ only like 2600lbs, with the much heavier 66 Hemi Satellites, low-mid 12's, with Bill "Grumpy" Jenkins & Ronnie "Mr.4sd" Sox driving... The 68-71 GS Buick 455 were like 13.35 et. about the same as the 66-67 Street Hemi Dodge & Plymouth cars were with out tunning & slicks... If I remember correctly the 69-1/2 4406bbl A12 w/Hemi 4spd & 4.10:1 Dana RR's were mid-high 12's with headers, slicks, famed Tom Hoover tunning & a pro driver {I think Ronnie Sox Mr. 4spd} in a Car Craft, Hot Rod, Mopar Action or some other mag. test, low-mid 13's in street trim... The 428scj drag pack Mustangs were Low 13's with out tunning, just like the 69-70 Buick's GSX 455 Stage I & II's 13.15, with there under rated 365hp/520+ ftlbs of torque, the 69-70 GTO "The Judge" 455 Ram Air III & IV were also in the same performance relm...