You will probably be OK for a day of EASY driving, as long as you havn't installed different injectors. The ECM will adjust the fuel enough although it probably woun't hold an idle (306 cam correct?) as they normally have to move the idle up a few RPMs (and whatever else they do to make them idle).
My 383 ran on the stock tune and injectors, didn't idle and did have a flat spot around 2G's. But I did manage to drive around the block with the front clip off 8)
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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