1.5 hp/ci isn't practical for a street driven BB Mopar. You can easily make 600 hp with a 400 inch BB Mopar, but it won't be daily driver friendly. If you want an LS then buy an LS engine. If you want a 400 inch BB Mopar then accept the limitations. There is no magic button that you can push that turns a BB Mopar engine into a LS engine. If you want a low deck engine that is reliable but powerful then I'd recommend building a 470 with Trick Flow 240 heads, a hyd roller cam, 10:1 compression, small headers (1 3/4 inch TTI most likely) and a Holley Sniper setup complete with Hyperspark ignition. That is a fairly simple combo that most engine shops can screw together and it will make gobs of torque and power. If you pick the cam wisely the engine will be smooth at idle but will put out enough power to put a 2700 lb car into the 10's.
