318/360 heads,with thumper cam

Thanks 273,youve been great help,-OldmanRick,yea i dont want to pour to much money down this motor,but ill probly have it for awhile,so i gotta do something now,if i buy an edelbrock intake,can i mill the head surface where the intake touches,or is that not good to do?also i just want a little somethin more,i already have headers,and the thumper i have would be the smallest of the three,the motor was running before i pulled it apart,to cc the heads,theres a few good machine shops in town,one well known is charging 70$ for the milling,and the other shop wants 100$,i think ill do the milling,and thin head gaskets,then maybe zero deck the block,i have headers also.if anyone could let me know whats a safe ammount to mill the heads,i greatly appreciate it thanks.