We use Vintage on most of the rides we build but prefer the Old Air Products for AD's. Fits up under the dash better, retains full size glove box, and can get with cable controls rather than vacuum or electric servos. Both have the same performance and price. Your LS should have a serpentine pulleys and belts which shortens the length of the engine and gives plenty of radiator room. Has been done thousands of times so a search should provide detailed pictures and answers.
