Hello posted this in TPI board but will post here to just in case to see what kind of info I get. Short and sweet... Did a swap on my 85 Z28 that came with a TPI 305 connected to a 700r4 tranny. Now there is a 350 sitting under the hood but she is running sorta rough. I have not replaced the injectors so she is still runnin off the 305 stock injectors. Only thing changed was the 305 to 350 plain and simple. What can I do to take FULL advantage of all 350 cubic inches? Also I am looking to swap in a cam that will give it a nice RUMBLE at idle. You can also check out my post with the same title under TPI if you want.

 

I have been reading and I do see this is an endless question HAHAHA. Okay so a Knocksensor is needed....

 

The one problem you have is the 85 ecm. It is not the same as the 86-89 and the 85 has VERY limited information about it. In fact, I don't even think there is a "definition" for it to change the eprom.

And yes, eproms are going to be a problem with the 85 ecm. If you wish to retain MAF and get an optimal BIN, switch the the later ecms, use the ARAP BIN to program your eprom and disable the cold start injector.