Yup magnum exhaust manifolds are a great upgrade! I like magnum heads with the 1.6 ratio rockers but remember you need a magnum style intake cause of the bolt pattern which new are almost 400.00 bucks. Only thing that sucks theres not alot of intake options on the magnum carb route, why i have no freaking idea lol. but if you got those 302 heads sell em help out with the cost.
