Age plays a big part in this. When I was a kid, I ditched all my flattie speed parts for almost nothing and put all my money into Olds stuff. Later I tossed all that obsolete junk and invested in SBC parts. In the '70's and '80's I got rid of all the obsolete SBC stuff like 3X2 setups with 97's and bought tunnel rams. I finally sold 2 pickup loads of SBC stuff for $200 and decided to go back to the REAL hot rod stuff. Whoops, too late. All the junk I sold for peanuts was now gold. Being old and stubborn I just refuse to pay a fortune for stuff I used to get for 20 bucks so I guess I'll never get to relive my youth with an Olds powered '40 coupe. If you're young, hold onto the obsolete stuff. It'll come back around sooner or later.