M1 dual plane vs chinese air gap

I'm putting together another La block with magnum heads. I am on a tight budget right now and came across a used M1 dual plane intake for a small block. I am looking for feedback. Is anyone here running the M1? Don't really want to buy the air gap knockoff and can't afford the real air gap. I should add that this is going to be a mild 318 street motor. Nothing outrageous.