Yes a 295 is easy with 2 requirements:
1. Must have the SAI mod which moves the upper balljoint downward and outboard. Not sure how the newer FFR suspension is configured and if the SAI mod is already provided.
2. Must use some Ford rack limiters to keep from hitting the upper A arm on the rim. I am using 10.5" rims on the front, but if you use an 11" rim it will make the rack limiters even more important.
I have run 315's on 10.5" mustange rims for 3 years with no fitament problems at all. No rubbing at all. The big issue with 335's is what rims will you run? The only 12" rims I can find are $750 each forged 3 piece. 3K was a little rich for me to have invested in rims plus another $1000 in tires. . I believe the 335/295 combo will be very balanced and is a good choice size wise. I have run 315F/315R and been fighting oversteer issues.
315 in the front with SAI mod:
Without SAI mod and rim hitting BJ: