1972 Demon 340 engine mods

Milling the heads is no problem, I have access to professional shop so all is up to deciding where to go with this, gather funds and stick to the plan.
What would be the best way? How much to mill down the Edelbrocks?
Perhaps some custom grind cam would be the way to go and still stay with solid cam idea?
With hydraulic high lift cams and hard springs there are often lifter collapse problems and it would be best to avoid it.
What would be the maximum duration that could work?
With VooDoo cams it looks like this:
- smallest hydraulic flat tappet is 213/220 @.050" .454/.475 lift LSA/ICL 112/108
- smallest solid roller is 231/237 @.050" .555/.566 lift LSA/ICL 110/106
- smallest solid flat tappet is 235/243 @.050" .525/.546 lift LSA/ICL 110/106

With solid roller above Lunati says 9:1+ compression so I was thinking that it could be run with Edelbrock heads as they are.

Also basic Howards solid roller cam:
- 229/237 @.050" .555/.555 lift LSA/ICL 110/106 (9.5:1+ compression recommended)


Yup we are far away with really bad access of parts and all needs to be planned well so when the parts arrive nothing is missing. Shipping is very expensive and waiting time is also pretty bad like 7 to 21 days... At least there is no problem with good machine shops.

I could open Summit store in Europe, this could make things so much better for people like me over here ;-)