1hd-t (90-95)is 12 valve 4200cc engine, in easy words our mechanics and kabaria know it as 12 valve. A year back it costed around 2.5 lac. It could be mated with H150f gear box or the better version H151f which is also mated with 24 valve 1hd-ft (95-97), 1hd-fte(98 onwards) and 1fz-fe (petrol) version in model cruisers.
Cost of H151f is arounds 110 grand. H150f will be cheaper.
4.5 lac price is for the 1hd-ft version also known as 24 valve.