the JB weld is used to fill the center mounted injector spot on oval port heads, with the split port LIM you have the injectors mounted in in the primary intake valve, but like i said before you could just get 99 3L heads that are split port instead and not have to worry about the porting(dont know the downsides thou)

98.5 Black SE ATX S&B filter, SVT MAF, optimized SVT TB, mesh grille, removed orange reflectors, painted rear reflector, gutted pre-cats, optimized SVT LIM, 19lb injectors, resonator removed cant afford an svt but lookin for 1 in nc