Thanks, Andy and Dwayne for all the info. Andy your tool really illustrates the problem as mentioned. I'm thinking I'll mock it all up and see how the pushrod angle looks with the centered lifters on the intake side. If it's not too bad, I'll lean towards the 861 AMC lifters. I know a member here had a set of the IMMs I could have bought, but I don't want to get a lifter that isn't available any longer. With the cam I'm using and my inteded use, I'll be swapping springs and lifters every 2 years to be safe.