305 TUNED? sorry man, auto f bodies were putting that down stock..
if you want a real tune from a guy who is known on the ls1 sites..
www.nelsonperformance.com
Allen will give you a tune that not only pulls the most you can pull out of the motor for your mods, but still be 100% driveable.
I have seen this guy when he first started tuning before he became STS offical tuner, he swapped a ls1 into a c10, bonestock down to the 2.XX rear end. it went 17's first pass, he tuned it to 14.8 before we left RCR that night.