Roller Cams
From my personal experience you will need to open the pushrod hole up to accommodate for the angle of the pushrods.....Cylinder head from the pre mag roller engines (308 I think) are already set up for this....I have x heads on my 360 and had to open up the holes a lot to make it work....As previously stated MRL has drop in roller lifters or you can check out Hughes....I got mine from Hughes...This was before MRL was making them....With these lifters you SHOULD NOT have to bush the lifter bores BUT it's best to mock things up and make sure before buttoning things up.....You may have to get shorter/longer pushrods also....You can get a retro fit roller cam for the LA engine so you can run the fuel pump if you're not doing an electric one....Magnum cams should work it jus won't have the fuel pump eccentric....Other than that it's not a problem....lol,...I don't think I miss out on anything....