E7TE's were used on all 87-97 Pickups and vans, plus the Mustang and Lincoln LSC 5.0. Not sure about the T-Bird/Cougar 5.0's, some did, some didn't get em. All the other car 5.0's got E6SE's.
Were those on a roller or flat-tappet engine? he needs to make sure his springs match the cam so he doesn't eat lifters like I did.
If they've got flat tappet springs, then nothing, other than a reduced topend limit for valve float's going to happen.