94 3100 into a 99 malibu 3100 vin j california?

[yukon joe]

i have a good 94 3100 and need to no if it will go into the malibu without any problems? yes it is the large port type and i am going to switch the upper and lower manifolds. it is vin j california emissions but thats only one tube that goes into the right side exhaust manifold and i was just going to switch the exh manifold. will i have any problems with the emissions or computer does anybody know i am getting frustrated please any reply will help thank you.

[3400-95-Modified]

I replied to your PM...

Pics of the pipe going to the manifold? IIRC there should be two inlets into the heads, not the manifolds... and there should be two on each head, front and rear.