I second all of the above, but good luck on finding a used 570 Street Avenger. I bought a 77 Merc Comet last month for $600, sold the A/C & power brake stuff for $100 , got a good used Performer RPM intake, 2 bbl to 4 bbl adapter and a good Holley 500 with it. The deals are there, you just have to look. The hunt is the best part of the process.