Well I have a decision to make and I'm pretty lost. In the very near future I am purchasing my carb setup and I want something that gives me the flexibilty to keep up with mild to moderate upgrades. So far I've narrowed this down to either dual 40mm DCOEs or R1s.

Currently my engine is an A15 with an H89 head, no porting or milling yet and the stock cam. Prior to start up I plan to unshroud the valves, install dual valve springs (and the required retainers), light weight pushrods, replace all of the other valvetrain parts and regrind the cam to make power to 7000rpms. I'll also run new extractors and a 2" exhaust to prepare for future modifications. All I'm looking for is a carb setup that can handle all of this and possible more down the road.

R1s are the cheaper option, so can R1 carbs flow as much as 40mm DCOEs?
I have seen R1s referenced for boost, is this easily achieved with DCOEs?
How difficult would you say tuning either setup is if you have a wideband O2 and basic understanding of carburetors?

I'm sorry if these questions seem dumb, but I am still doing research and I want to make this choice once and not regret it later. If you have any personal experience with either or both setups please feel free to share. Thanks

-Jacob