Are you aware registration cost of 70 series is something in between 3-4 lacs and as i know minimum cost is 3-4 for army auction 70, engine it self is 3-4, suspension 50k, other body work etc 1.5 lacs total some what cost of 12-15 lacs not so cheap
Now suggestion time: Find already reg 1hz 70 series which should cost 12-15lacs, or find resonable already reg vehicle for 6 and swap in engine.
Best engine would be 1fz-fe it the one which we see videos of doing crazy stuff... but daily use not suitable because of 4-5kpl fuel avg
Best engine would be 1hz its an all rounder.
last but not least 3f is one dheeth engine but not good for highway travel and mileage