Should I mill my edelbrock performer rpm intake?

I’m trying to get my aluminum edelbrock performer rpm intake to line up and bolt down to my aluminum edelbrock performer rpm heads. The engine is a 383 and I don’t believe the deck has been milled at all? Not positive about that because I didn’t build the motor when it was done about 20 years ago. I tried putting the intake directly on the metal valley pan and it has been a nightmare to get it to seal tight with no vacuum leaks. I’ve had the intake on and off 3 times already and I’m done doing it without the gaskets. I decided to use the thin felpro intake manifold gaskets. I’m not positive but I think the gaskets are about .030. I wanted to use one set between the valley pan and head and above the valley pan up against the intake. The problem is that even though the gaskets are thin using both sets which I think will give a great seal isn’t possible to line up and bolt down. Does it make better sense to mill the intake slightly maybe .030? I’m thinking mill it as little as possible to make it fit. If I recall correctly the bolt holes still line up with one gasket so milling it .030 would work. I thought it would be a better idea to mill the intake which is much cheaper than milling brand new heads that are already on the engine. Is that something that can be done very easily by most machine shops? My only concern is that if I ever want to use the intake on another engine I will have to use gaskets from now on.