I've been probably putting too much thought into this for my cam swap.

I know that the XE cams and probably the summit cams are based on the chevy lifter. Does this cause any drawbacks on a 383/440's performance since it does not utilize the max surface area of the lifter as mopar performance and other mopar cam dealers have set theirs up for?

Mopar performance cams are not set up to utalize the mopar lifter.

Engle, comp, and hughes all do but comp only sells them if you get a custom cam, both Engle and hughes have them on the shelf.

You will not "lose" anything because even the factory cams don't make use of the large lifters but it is like free HP if you do use the special lobes. I honestly don't know a reason not to use them, even mild combos can benifit from useing the mopar specific lobes.

Comp MM lobes are designed for a .904 lifter but the risk of engine failure goes way up when you start to use parts like that.

Why's that? What is MM?

If you're going with a hydraulic, look at the comp XE-HL cams or the Lunati Voodoo cams.

MM is comps most aggressive lobe for the .904 lifter. Yes parts failure can go up without makeing sure your lifter bores are perfect (bushed most likely) and good lifters to handle the aditional spring preasures. The smalles MM comp lobes start out above what I would call mild, hughes has some good ones that are not as wild.

With out makeing sure your lifter bores are perfect I would recoment use the ford specific lobes instead of the MM to be on the safe side, they are more aggressive than a chevy lobe but not as aggressive as a mopar lobe.

The .904 lifter is just more durable and cam support a "tighter" lobe ramp for high end rpm racing. Cams around 268 duration and .450 lift will not gain free HP , just because the lobe is cut for a .904 lifter. I could be wrong, can you explain the .904 lobe design bebefit for all purpose gains.

Well the point is the larger mopar lifter can allow for a faster lobe ramp rate, giving a higher peak lift than a chevy lobe at a given duration. Should give you more flow area under the curve, but on a small cam like a comp xe268 with it's 226/230 @050, the gains between grinding that cam on a chevy lobe versus maxing out the lift on a mopar lobe aren't going to be massive.