My 273 build

So I am building the 273 in my 67 dart GT it's 30 over and has 360 swirl port cop car heads milled spun the bearings and got the crank hot . Have the 30 over 10:5.1 Pistons from egee and thinking about using the 4 inch egle crank. I know guys say it won't be able to breath but I don't see a problem with the 360 heads. That I was already running on it however I am going to put umbrella valves in. Just clearance issues left Maby. And yes it would be nice just to put a 318 or 340 but I want to keep her numbers matching. This car very low original miles had the certicard in excellent condition original radiator hose with the blue stripe still like new . Anyway any advice or opinions. Anyone out there try this. Thanks mopar brother's and sister's