Magnum crate help

Run your pulleys,yes. The 380 horse crate ,came with a M1 single plane manifold. Also came with a bigger hydraulic roller cam. Specs: .501/.513" lift,230/234 @.050 hydraulic roller. The 300/360 crate came with a dual plane,and a smaller camshaft. I would dial indicate the lift..420-ish,the 300 horse crate ..500" ish the 380. Both the same basic Magnum truck short block.If the 300 h.p. cam,can be reground. Would require custom push rods. You never stated what your expectations are. Under 5500,3:55 gears run it. You will be buying tires more often.