Well after rebuilding the lg4 its time to say goodbye. Im not sure what 350 to go for though. I have a holley high rise manifold and a holley 750 cfm dual feed carb, brandnew. Ive seen the crate motors that have 330 hp with the vortec heads but I've heard that you have to have the vortec manifold also. What motor would I need in that horsepower range to be able to use the carb and manifold I already have.? And what would I have to do to my 87 camaro to do this change?