Something made me scratch my head

OK!!! Here is what I am woundering becouse my 170/ runs much better then before, and I don't mean just a little bit better it real runs much stronger.

I changed the plugs just a couple days ago and went with the proper plugs.
I did what 66aCUDA said and Dan and other / guru's here said to go to...

Here is why I scratched my head and thought about what I did.
Remember I have a 66 model drool tube factory 170 head..

The old plugs I pulled out had washers on them and about a 1/8'' shorter.
The new plugs I did removed the washers and they are a bit longer.... The NJK plugs go farther into my head then the old Champions did... So did I have lower compression with the old plugs ? and higher compression with the longer NGK plugs
Taking up more room in my cylinder = a little bit of more compression I believe :-k

Am I crazy ????, or did this accrue by just doing my matching electronic system and getting rid of the original old points coil and just installing the NGK plugs to make my little / feel mush better ?

This is what made me scratch my head :-k or chin 8-[