302s on a 360?

A point of compression from 6cc?
I don't think so;
my math says maybe 4/10ths..
Your swept (at 4.00x3.58) is 737.4cc
To get 8.0 Scr requires 105.35cc
Subtracting 6cc is 99.35, and so
the new Scr is 8.42

In a throttled situation, this will make as good as zero difference.
It won't show up until WOT, and 'round about 4000rpm, or a lil sooner, those small ports are gonna put the brakes on.But with a stock cam,that's no big deal.
As others have said,you already have them, so just run them. I'd put an intake on them with matching ports tho.
Oh wait, I already did that,lol.
As others have said; it will be fine.