Drilling Magnum heads for LA intake pattern

Who here has drilled Magnum heads for the LA-style intake bolt pattern? Does anyone have a link to a possible template to do so or have advice on how they told the machine shop to do it? Now before you ask why, it's for IMCA and USRA dirt oval track racing where they only allow factory lowrise 2 barrel cast iron intakes OR Edelbrock 2176 or Weiand 7545/ 8022 and you guessed it, they all are LA style bolt patterns. I already have my 318 magnum built for a high-dollar stand-alone figure 8 league but I switched so now I have to backpedal to more straightforward rules and drill my already prepped magnum heads for LA pattern. Thanks in Advance!