360 LA to Magnum swap, How hard is it?

On a 99 Magnum ,generally yes. You will have to offset grind/ drill one hole on the stock flex plate. If a weighted 360 converter,knock the weights of. The 99 flex plate is already counter weighted. You need to run the early LA timing cover,to retain the p.s. ,alt ,water pump setup you have. If carbed,you need a new Magnum manifold. Mopar,Professional Products,Edelbrock there. If running a v belt setup,you need to replace that awful harmonic balancer. Use a Professional Products no 80012,use the Magnum supplied counter weight. More tips and tricks at www.Magnumswap.com.Nice car you have.