You have to remember that the 1025 rwhp it showed on the dyno was through a near 7k convertor a powerglide and big side wall tyres, with a manual i'd expect it to show another 100-150rwhp.
Really the engine is only a baby in comparison to most big name 2jzs, its only 3litre, standard comp, stock inlet valves, 1mm oversize exhaust valves, moderate porting but leaving the port cross section stock. The cams are only 272s with 9.3mm lift etc. It'd be making damn near 1300hp at the engine. Alot of people BS about the amount of boost they run to achieve similar power figures, 50-60psi is not uncommon on some drag 2jz although i have heard most report 30-40psi.
At the end of the day i am trying to push 1220kg to 180mph in a 1/4 mile. At 45psi the engine makes enough power to achieve this, just need to get the car to haha