Automobile(s): 1977 Coupe (blue), 1977 Coupe (yellow), 1977 Coupe (green)
Re: what holley 425
As far as I am concerned they do not make a good replacement Holley for the Rochester. Holley did make a spreadbore as replacement, but they are rare and hard to find. The Rochester will flow up to 850 cfm. and you can tailor that, but it takes a lot of study. Believe me, stay with the Rochester. I should start rebuilding some of the carbs I got hanging around.