on they did have problems with the cooler line return filters early on

http://www.xkjeeps.com/tsb/tsb_xk_2101505.pdf

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4