I purchased the ECI kit from AERO in Granite City, IL. Per Jesse, who is the engine guy there, the thrust washer isn't really needed. I guess it depends on who you talk to about whether it's worth while or not.
I assembled the kit w/o the thrust washer, changed to a horiz FI system using AERO's sump and still spent less than $20K. It looks great, but I'm not to the stage where I can start it yet.
By the way, AERO's support was great and they helped me with things that ECI doesn't supply, such as hardware, etc.
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