Not to pile on but in your second post you used the words Sprint in referring to the motor you are pulling. If that is the case and it is a matching number engine, you will be throwing several thousand dollars down the drain if you ever sell. But I do agree with crazecars, if you are going to keep the car you might as well put in what you want. You can drop in a Yugo engine if that is what blows up you skirt.

I believe a lot of people buy these Firebirds looking at them as cheap Camaros. As such their mentality is pulling a 6 banger and dropping in a 327/350 will only increase the value for resale. To some people it doesn't matter. To the majority it is either a deal breaker or represents a significant reduction in value.