Not trying to start a flame war...just voicing my opinion. How much is he charging you for the labour? How much is the parts going to cost? In the end It would be more pratical to buy and Alltrac. Good luck getting the floors from a Toyota dealer....this car is already 10+ years old and Im sure they dont stock parts like that in there warehouses for cars of this age, just try finding a skirt or turbo that doesnt have to be shipped in from Japan. I would love to see some pics of your friends conversion. In all likely hood the floor is going to have to come from a donor Alltrac, in which case you might as well keep it that way. You have to remember that there is alot more than just the floor that needs to be replaced...there is alot of structural metal added in the Alltrac floor plan to make the body more rigid for the AWD drivetrain. What year Celica did your friend do the conversion? Is he a licensed autobody repair man as well? Do you have any pics of his conversion? How much did it cost him in parts to do the conversion? Like Brink said you will also need the ECU from the Alltrac with the different maps for the added driveline compnents and added weight. Also a 5sfe/3sfe wont make any where the amount of HP and TQ needed to propel the car forward do to the added weight and driveline components. Like I said earlier it would be more practical to buy an Alltrac...took me 10 mins to find these ones.
1988 Alltrac
1991 Alltrac
1990 Alltrac
1990 Alltrac
1993 Alltrac