na dont mate,when i bought my car in boxes the boy had had the block long studded for 6 (mountune) stud kit and 4 arps for other 4,i phoned around at least 3-4 tuners asking about this and they all advised no for the arps as they are supposidly too hard/strong or some shit and can crack block,then i seen in 1st hand on a friends

just give machine shop your 18mm socket tell them which 6 are required and get it done it aint dear,ive had it done twice now,the grinding down of a socket is ok for the later heads not an early 3-door one