Most agressive fitment on 61 impala

[boosttoy]

Good evening everyone.Whats the most aggressive fitment for tires and wheels on my 61 bubbletop,It has side exit exhaust and ride tech air suspension.i am looking to go with 18s and 20s or 20s on all 4 corners.Thanks in advance.

Thanks,137176Frank

[USAZR1]

Nice bubbletop! What size rolling stock is on the car,now? How much clearance do you have to work with?