You should just pick up the phone and talk to Tim at FHO. He can make what you need. Add the o-rings around the ports to seal up the intake side, get the correct guide clearance, all that stuff. Won't be cheap but it will work.
I have talked to Tim, would love to have his heads, but $5000-6000 is not in the budjet. And Edelbrock clearly states that a 4.375 bore is minimum to use their head. Taking the great running engine apart to chamfer the bore is out of the question. So, it is MP head or nothing.
