Close to EFI performance.
Cold winter starts ease and drive away Notta yet.
The Holley Sniper is the best bolt on EFI you can buy.I calculated the cost of an Holley Sniper EFI and found out that I have to drive nearly 8 years to get the cost in for fuel economy.
The cold start is one + on the EFi side.
I use only manual chokes, trouble free and "self tuning" by cable.