I've put two of these on and didn't drill either one any deeper, just got shorter bolts from lowe's. Get a bottom tap, tap the two holes without drilling them any deeper, get shorter bolts, use RTV, and bolt it on. DON"T overtighten the bolts or you'll crack your valve cover. No more leaks.
85 CJ7 258, borla header, Team Rush, MC2100 ,optima batt, Warn 8274, agr super box 2 & pump, T5 w/ B&M shifter, centerforce 2, superior 1 piece axles, warn hubs 2.5 in lift, 31" BFG MT
85 CJ7 258, A/C, T176, MC2100, Team Rush, Warn XD8000i, superwinch hubs, 3in lift 31" BFG AT/KO