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I used spade terminals with heat shrink in the past. The spade terminals loosened and the heat shrink continued to shrink from the heat until all of the terminals were exposed. That is why I strongly recommend the Packard or Aptiv terminals.

The 6.5 engine I bought for my truck has porcelain boots.

That is the type of terminal your do NOT want to run. The automotive terminals have springs built in to them so the resist loosening but more importantly tolerate more plugging cycles. They also have a tang to hold them in the connector body. But, Packard 56 covers 1/4 inch wide terminals. The...

Don't buy too many. I'm not 100% because the dimension drawing doesn't have a width. I think it's 2.5mm. The connectors were originally made by Packard, then Delphi, now Aptiv. The plastic holders should be available as well but I don't have time to search them down.

If you do decided to replace your terminals they are still available from the OEM. https://www.mouser.com/ProductDetail/Aptiv-formerly-Delphi/15418891-L?qs=Z%252BL2brAPG1K4n7tNKtpd3Q%3D%3D You don't want to use spade terminals from the auto parts store, vibration will open them up. It needs to...