66 Mustang fastback

A work in progress. I have a couple of options. One option is a 94 Fox Body Mustang 5.0L GT parts cat, use motor, rack in pinion, disc brakes Ect. Option 2 which I'm leaning towards is improve the suspension, brakes, steering with after market parts. Part of the enjoyment of classic cars is the period driving experience. My Mustang has had a 302cid with nice 5speed OD transmission installed by a previous owner. One of the things high on my Priorty list Is better brakes maybe with a booster. I would love to hear from other builders as to the benefits of each . Either the fox body build or the after market build.