That caddy will jerk your truck around smartly, even bone stock. And the fuel economy will surprise you That combination was designed to hual 6000 + pounds around town and still jump when asked. You can spend a ton of money building a 600 HP, high rpm screamer, but it's really not necessary. An intake manifold and carb swap and some ignition upgrades will give you coffee spillin', tire shreddin' torque and a rear gear change will get you a 17-1800 RPM Fuel sippin' cruise without loosin' the snap. Check out
http://www.cadillacpower.com/forum/ What you want to do has been done before, for way less money than it takes to build any other big block. RED