Check the year of lower plenum that you have. If it's 94 or newer it will not match the ports on the heads. There was also a lower intake gasket thickness change about the same time. You will have to make sure that they are all compatible before proceeding. I found this out when doing the same on my 92. Your best bet is either getting a 92 lower intake and having JWT machine it, or getting an adapter kit from Bernie. If you change the lower intake you will have to change fuel rails as well. The kit from Bernie is probably the best way to go. Contact him and he can tell you all about it. Hope this helps.