Wilwood kit vs Dr Diff Wilwood kit, help??

"mid to low 10s at best, not a drag car" is so funny to hear these days. 30 years ago that was 100% a drag car. my buddies' 69 Super Bee with a dual tunnel ram 383 and plumbed nitrous was getting 11s back then as a full 1/4 mile car. Now it's 'meh' compared to modern output