The L98 Aluminum Corvette 58cc Heads are not so easy to come by these Days . But you still can Find the Iron L98 F-Body 64cc 5.7 TPI Heads . I Paid $100 Bucks for the Set I used . I used them Iron L98s on a Dished Piston 350 with .015" Shim Head Gaskets . It has just over 9.25.1 C/R . With most Flat Top Pistons it will be 9.8.1 C/R . The Silv-O-Lite Flat Tops at Zero Deck will push a 355 Build to 10.4.1 C/R . Here are some Photos of the Corvette L98 Heads . For what you would Most Likely have to Pay for a Set ? best to buy New Budget Performance Heads .