Intake Options

I have a 340 with Magnum heads and it has the magnum vertical intake bolt pattern. Right now I'm using a M1 dual plane with the angled bypass hose fitting and the bolt bosses for the RV-2 AC brackets.
As far as flow it's an aluminum version of the stock cast iron intake and while it's not terrible, it's not in the same league as a Edelbrock RPM. Wondering if anyone has taken a LA intake and drilled it for the Magnum bolt pattern? You would need some wedged shaped washers too. I really don't want to remove the heads to drill them and I don't want a Edelbrock knock off either.
I bought my heads before there was a LA or Magnum intake bolt attaching option.