GM did an interesting build on one of those L99 265s to put into a 1955 Chevy back in 1995. They used the Hotcam and IIRC LT1 aluminum heads. Made about 330 HP @ 7,000 rpm. They backed it to a...

L99 4.3 V8 is based off the LT1 setup and uses the same PCM although a different calibration than the LT1. Most B-cars seem to have $EEB files. Should be a 4.3 file on this site if you need one. ...