Get over on the Supra boards - if you're talking about the 82-85/6 Celica that had the front end that looked like the then-new Supra (first one with the DOHC six), I've seen those Supra's with small blocks in them before. If it'll go into the Supra, it should go into the Celica. However, the rear end set up was different on the cars, as was the wheel base. Weight distribution is gonna be a real issue - I'd want to set the engine back, which will involve cutting the firewall, enlarging the tranny tunnel, relocating HVAC stuff - major work. Also, the Celica rear end won't stand up to the 5.0L abuse. If it's the earlier Celica (70's) - major work. Weight distribution, rear end's not strong enough, wheels wells in the rear aren't big enough, the V-8 will bend the unibody like a pretzel unless you stiffen it up with a stout roll cage, etc, etc. How good are you with a welder and major fabrication?