New to the boards and looking for a little info to get my project going. I'm doing a swap with an 03' Silverado 5.3 in my 66 Buick LeSabre. Porting and polishing the stock intake and tb as they outflow the LS(may go to LS6 depending on if I need to switch out injectors or coils), CP LS Cam, pac 12 springs.. Bolting up the stock ST400 (rebuilt) with in dash toggle. The donor engine came with all accessories but no ecu or wiring harness. I've considered getting a used harness and having reworked, also buying a new unit from the various vendors but I've been hearing about the EZ LS and 6LS controller units...My question is using either one of the controller units what else is required to get the system together and running? Or just these units? Want to stay efi if that helps.

Thanks in advance for any info.

 

Buy this one so you can tune the outer cylinders better with the shitty distribution you'll get with a small carb'd intake.
http://www.daytona-sensors.com/SmartSpark.html

Edit: If you are doing all the engine work above there is no reason you cannot convert a harness.

 

Thanks for the info. I wound up going EFI with a BP Automotive Standalone harness