Picking Carb Size: 950, 1000, or 1050 CFM?

4.88s for street?
Hah, I tried that,and, IMO,it sucked.Sure 7200 got me 100kph/62mph at the top of second.
But cruising 62@3760, well,IMO that's crazy.And with street suspension and 325/50-15DRs,my little 360 didn't stop spinning at the track all the way thru the 1/8th ending at 93 mph! and that with a 750DP. My conclusion was 4.88s suck. But if you like 'em so much, I have two sets I can sell you.
So then I installed 3.55,which still spin all the way past 93 mph, but now I can cruise at 2734, over 1000 rpm lower.
4.88s allow for 7200@119mph in 4th gear.
BTW
OP said"not frequently"
4.88s are very low gears for the race track. Most guys with big power will be running 4.30s
4.10s are very low gears for the street.On the street with big power, any old gear in the 3s will do, with 3.55s being middle of the road.
>OPs BB in a 67/69 Dart will be down at under 6pounds per horsepower. Good luck making that stick on the street below the speed limit,with any tire that fits in the stock tubs. It's hard enough at 9 or 8 #/hp