Maybe Im a little conservative in those figures, Im not sure the stock cast manifold would alloy the t28bb to spool properly to make more but would love 240-250hp yet prefer 100lbs from a low 2000rpm rpm then peaking to 280lbs. More like low hp high torque WRC turbo engines of current.
Im purely staying away from the 4 port head I have due to extra 10kg, less room in my bay and low torque ability compared to the 8v.
The FJ is one of my favorite Nissan engines and i would have one hands down in a 240z or s12 even s13 over any heavier six or complicated sr20det. There is even a few ka24de headed L series down under that are perhaps a tad lighter and more compact up top due to the small angle design head that interest me but compared to the little CA the L series is quite long unless alot of money is spent on a simplex compact timing case with CAS ignition and side fed water pump. Especially when the QR25DE can be fitted with a modded FCW SR20DE crank for revvy 2.3 hybrid much lighter but perhaps the ugliest looking engine nissan ever made