3:54 vs 4:10 with a low deck 499

in an a-body I'd do a 470 like suggested with the 240 tf heads if it 's a street car, a friend built that same motor with a 550 hyd cam 240 heads 11.0 comp, in a 63 belvedere with 3.91 gears, he ran it at the track 11.07 with lots of tuning left. single four bbl. 800 avs. pretty darn fast with no tuning.