273 Bore Taper

How many miles are you planning to put on it? I've re-rung 383's with 0.010 taper but they weren't 100,000 mile engines. If you have 0.003 to 0.004 I'd say you are good. And brian6pac is right, it doesn't matter how minor the ridge is, it has to come out. What I always found interesting about re-ringing engines with a lot of taper is that people think the ring seal to the wall is the concern. If you realize the ring is moving in the piston grooves with every cycle, you'll see the ring lands wearing more than anything else.