Just did this with a 5.9 magnum. Many aftermarket hyd rollers have extended nose that allows for the stock LA fuel pump eccentric. Eddy heads use a longer push rod than stock. You'll need a 45 degree pipe fitting to adapt the Magnum bypass hose outlet to the LA water pump. You may have to shim the left motor mount bracket, ear distance is different. You can bend the throttle linkage to fit the magnum intake.
https://www.forbbodiesonly.com/mopa...build-how-i-do-it.187572/#post-911485726
Doug