Hi Guys I am wondering if any of you can help me.
I have a 1984 Corvette Crossfire which has a rebuilt engine,Crane 2040 cam 1.6 R/rockers,alloy 190 heads,Renegade manifold,bored & rebushed T/bodys,full length Hedman headers .true dual exhaust system,and it runs like a pig if you can start it.
I have been told that maybe the original ECM is not coping with the changes.
My question is : Is there any members that I can ring or speak to who may be able to help me,remember I am in Western Australia,and these parts and knowledge aren't easy to obtain
Any help will go a long way to please me
Thank you

 

You were told right. Can't make those changes and expect it to run without major changes to calibration. No one has bothered to hack the stock ECM on an 84, just not worth it. I started by using a 7747 but eventually went to EBL by Dynamic EFI. Down under, you can try pinging on Ben73 here in 3rd Gen.
He had a 383 TBI motor in his 84. He was using an 8746 IIRC. Running mid 12's. The guys who did the Renegade are also knowledgeable and could help.
I ran a stock block 5.7L port matched Xfire w 2.13" TBs, TFS23d heads, Comp Cams roller cam and full roller valve train, TPIS headers, MSD ignition.