The 302 has been done by several, some searching will turn up the threads. No more difficult necessarily, but there isn't a ready made kit like the SBC.
Is it a two or four barrel? The two barrel made 210hp factory, I believe the four was rated at 250hp.
I had a 70k mile two barrel from my rusted out '71 Torino. It ran very well, and was strong enough to break the old bias plys loose hitting second gear in that big car. After the Torino expired, I swapped it into my six cylinder '66 Mustang. As is, with zero mods, a two barrel and automatic, I could walk away from my friends new 92 GT (which ran 13.8's). That should be a decent performance comparison, as I would estimate the car weighed around 2500lbs.