Is it ok to spray these plugs?

 

No.

 

That seems like a pretty cold plug for a 50 horsepower shot, see what others say though. I ran 100 on a TR55, but it wasnt an LT1.

 

I dunno about the TR55s, but I ran a 50 shot a few times on my AC Delco platinums at the stock .050 gap and when I pulled them out they had a bluish green color on the electrode. I switched to Autolite 104s at .035 and they're doing fine. (Copper plug)

 

You aren't supposed to run nitrous on a platinum plug.

 

N2O will cause the platinum tip to melt off. If you are unlucky...like some have...that tip will get lodged in a valve or piston.