[QUOTE=ProStreet R/T]I wouldn't worry too much about finding the tires. My guess is that michelin will be replacing them with a newer model. LOTS of cars run huge 20's out back these days so no worries.
Plus Pirelli always has the 345/25/20.
Yes lots run 20" but i dont think a french tyre company would actually give a rats a$$ about the aftermarket if only 1 car uses this tire size ( just my .02 woth) and yes Pirelli makes a 345/25/20 but I think it is a little too low a profile, i did notice that they also now list a 335/30/20 but the "list" price is 1489.00 EACH now that is canadian $ but still.
Hey thanks for the comments i will post some start pics of the 2 67 Chevy II we are starting on 1 will be a ls2 t56 protouring deal and the other will be a fast street car 572 hillborn injected 4l80 4 speed auto tim mcamis prostock chassis you know just your everyday cruiser