Probably the cheapest thing you could do is find a running Magnum engine swapped to 4bbl makes 300-320hp depending on manifolds or headers, add cam for 350-400 hp.
My man killed it in this post here! No doubt.
However! IF - IF you want to rebuild what you have because you want to.... then a full kit should be ordered. Call Summit for there basic rebuild mits that includes everything. You’ll need to take the block and crank to the machinist o know how big the cylinder bore will be and what size crank bearings to order in the kit. Summit can also swap out pistons for the cost difference.
Then order the cam, lifters & pushrods (in stock length) and assemble it.
If you do the Magnum route, sell the LA part by part to recoupe the some of the cost. If not all of it.
