What size wheels?

hey guys, what size wheels and tires will fit on my 64 Signet, I want to go with 17's or 18's. The car has 73 Duster front disc brakes, 8.75 rear w/ 2" lowering blocks, the rear springs has not been moved and has a big bolt pattern on all fours. Reason for this move is the 14's make it very hard to find the size tires I need for the stance I like to see for this particular car. The T/A's on the rear are horrible for traction as well as cornering and I do not trust them driving in the rain. Finding tires for 14's is becoming a real PITA. Car has 245-60-14's on rear and 205-70-14's on front using 7" police car wheels.

I like the Coys in flat black with the polished lip and do not want 14" or 15" wheels. So I figured you fellas would know which wheels would fit perfectly without playing games with the rest of my Signet.

I love the look of my Signet yet really need to change the wheels and tires, What do you see for this