88 supra

Hello I'm looking for some help, I have an 88 supra that had a bad knock in the motor. I change the motor with the same type of motor, now I cant get it to fire, its getting gas its turning over just fine but it will not fire at all. Does any one have any suggestions

Spark? Did anyone touch the distributor/timing? By the way is this a turbo or n/a? All i could do is say check all the connections for now, check the ECU codes too, maybe something is busted that your looking over. If it ran when it was pulled it should run when it's put back in, unless you left something unplugged or broke something.