i am saying what can be done, personally i have a super strong 4130 moly 9 inch in my car, big tires and 14pts worth of cage, but on the same token, many things that i see people doing in the GN world are far from safe, and sometimes just shoddy looking, but alot of people still do it, i just stating what can be done, the end choice is to that person, but many times we hear over and over you can't run a single plane intake on the street, you can't run over 3,00o stall on the street, anything over 4.11 for gears is too much for the street, 8.5 in rear won't last, you need a 12 bolt, and so on, and lastly don't run a mini spool, i did all of those on the same car, with slicks and nitrous, granted there are gn's runnning faster than i did with all that stuff, but the stress on the rear end was at or above most gn's running a 8.5, it can be done, the end choice is to the owner, but auto racing has always been going as fast as you can with the least ammount of money, and for the people without a ton of money its a cheap way to go, side note: YOU NEED AN OPEN DIFF TO RUN A MINI SPOOL, if you have a posi rear, it won't fit at all, due to the cut case in the clutch area.
Grant