The LT1 is old news and not worth investing money into. They were ok motors when they came out and run good when they do. The problem is LT1 ignition systems suck the OPTI SPARK is the worst idea GM ever created. So lets put an electrical device that is extremely sensitive to moisture directly under the water pump (not smart). For the same price as a used LT1 motor you can easlly obtain a nice used 4.8 or 5.3. The 4.8 and 5.3’s are much stronger than the LT1 (especially after 2005) and the power potential is far greater. You put a decent cam in a 5.3 and 400 plus hp is no problem and you dont have to pull off the intake to do it. The ignition systems are solid, heads flow great out of the box, no OPTI SPARK, no rocker adjustments, great gasket sealing technology, and a much more plentiful after market. The cost of a holley pan and some swap mounts are less than $500, its well worth the cost. The value of your car will be much greater also with the 5.3, the future is in the LS platform not LT1.