NO WAY! 185's are the biggest you can go on a Stang!
Not sure about your typo. but I figured that I'd get in on the ragging.
To be fair to GearHd6, according to his car-domain site, he does have
STEEDA Round Bar Subframe Connectors
STEEDA Strut Tower Brace
STEEDA Battery Box
BBK Adjustable Caster Camber Block
BBK Shortie Headers
MAC 2 Catted H Pipe
MAC Cat Back Exhaust with stainless tips
Otherwise, like others said, 225's are the safest. 245's are really pushing it on a 7" rim. *I* wouldn't trust anything over 225 on the street. You could be going around a hard corner and you could loose the bead seal because of the side-wall ballooning with the too wide tire and the stress.