Drilling Magnum heads for LA intake pattern

Thanks!! Seems to me that using a "virgin" OEM LA head I could make one fairly easily. The center mark seems like an easy means
Possibly but intake can’t move plus you need the bushings to align the drill bit, then how would you drill the two center ones? If you sawed off the head side of an intake then you’re right where my template is less the guides and sleeves so...
And I did use a virgin LA head, a J head, to make up the template.