ok dude,it looks like you have the 3rd gen motor.
but make sure,have them send you a picture of the back of the motor showing the Intake
,and the front showing around the Turbo and Oil Filter
should show four(4)individual big runners and not 8 smaller runners casted into one.
yes the mounts from a 5th or 6th gen gt/gts celica or 2nd and 3rd gen mr2 can work.
the tranny that is going to come with that motor is going to be one of the toyota e 153 (i think)trannys they are skightly diffrent from year to year and you would have to correctly choose the shafts you are going to use.
if you are going awd,that tranny will not be able to use.
if you trouble finding an awd tranny,i can sell you one for a good price(so good you wont believe,cause shipping is going to be a bitch to get it to the mainland.)
alot of stuff,you would have needed for the 2nd gen motor,you would not need for the 3rd gen,air flow meter being the main one.(but you have to confirm with the seller that it is infact the 3rd gen motor)
harness: you realize that the harness would have to be cut and extended right.
its from an mr2,its going to be short,and even if it was a celica,it came in on the oposite side in the jdm cars.
note. there might be a funny looking wire in the harness,i think it looks like a small co ax cable,make sure you have the means of getting it joined back.
(i'm going by memory,and it has been a long time since doing those swappes,back then i had the "racing drive" and my friends,some of which are very technical people were not married with kids etc.and had the time to screw around with projects like this one,in the name of speed.also the harnesses differ from car and year and specification,us,euro,jdm etc.
rear wheel:more work,alot more if you are going original.
are you sure it wouldnt be cheaper to purchase a 6th gen gt4 and spend the money to have it converted to left hand drive.it can be shipped to a company in florida that will arrange for it to be done in the dominican republic and shipped back to florida.
btw tell your dad to get a mig welder and a small plasma cutter.
good luck dude.