You're right.
There is a lot to be left behind and gained with Blueprinting, rollerized and smaller items etc.
About the only two things that I have explored and applied is the engine blueprinting and keeping my factory drum brakes. Not only are the factory drums lighter than the factory Disc, they can be backed off at the track for some free wheeling power. Now stopping with them is a whole other dark art. That's why I only do it at the tracks with a lot of shut down area.
On the street, I suggest bringing 'em back for some drag on the brakes.