If the 98 454 didn't have vortec heads, you're gonna have to throw a ton of cash at it to make decent hp numbers. For the same money spent, you could almost build a SBC of equal performance with a bit less weight. If anyone tells you different, let me know. I've been looking for economical performance mods for my 95 non-vortec 454. Now, if it's a vortec motor, you could sell just the heads for more than $500. That would be a worthwile investment.
