cool car.. love the mini-tub...
now for the front suspension. UPR has a tubular K member with all the goodies for a great price. this is a way better option than cutting it up. I would have probably never done the mini-tub on a 93 COBRA... but then again, it is not my car. You shouldn't have a problem with the 275/35/18. Try a 265/35/18. that is the size I run on the front of my 96 Cobra. Mine has all the simple stuff: springs, adj. struts and shocks, bump steer kit, steeda X2 balljoints, poly endlinks and sway bar bushings, UPR upper and lower control arms in rear, and Subframe connectors.
also, if you are looking for excellent package deals for the front, check out
www.maximummotorsports.com they have real great race proven pieces.
good luck!