Clangers

Hey fellas, so recently purchased a 92 gtst rolling shell and it seem as tho it has an auto dash, it has had an SR and an RB25 in it before has modplates and was last registered with a sr20 in it, so my problem is will i run into any problems when i go too put a RB25 in it? is there anything that can be dodgy about auto conversions that i should check on or is there anyway i can tell if has been? can post pics if need be,Cheers.