Ouch. Just got fully bitch slapped by Bruce for even contemplating 135's on the car. I wouldn't want to suggest 125's or temporary spares and see what he had to say but I'm sure it would not be pretty.
("Bicycle Tires! They Don't Turn! They don't stop! They SUCK in the wet! They have no load rating!")
SO, if possible let's focus on the 145 solution. Geoff, you were first in here, any chance that you've got a line on any?
I've had it suggested that 155's would also work although I'm not sure that would provide enough clearance - with more caster making them turn more top to bottom/less side to side, and more negative and camber in the front end getting the tops in a bit the 155's might. Working on the front end stuff now, any feedback is appreciated from those who are running similar set-ups - stock car, stock wheels, 2 1/2" spindles with the extra 1/2" offset.