TF has figured out how to make sure the seals won’t come loose in operation that’s for sure.

They’re really on there.
Having a replacement set on hand is a good move.

I’ve been able to get them off without totally ruining them before, but it’s time consuming.

If the bottom of the seal is right against the step of the spring locator, then it’s even harder.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads