So i picked up a used Motordyne 1/2" Spacer with Copper ISO Thermal, but it didn't come with the isothermal gasket or the gasket for the throttle body to put the copper in. do i need these parts, or are the gaskets enough?

let me know thanks!

 

The iso thermal system needs the Aramid gasket to work.

Otherwise, you should probably use a new gasket on the throttle body.
The old one is likely to seal, but there is a chance it may not. If you do, you'll know for sure once you try it.

 

So would it be safe installing the following

Spacer
Copper throttle body spacer
New Throttle body gasket

and no aramid gasket

 

Absolutely.

EDIT: On the condition that you don't unbolt your lower plenum in the process. Unbolting/rebolting is what disturbs the stock metal gaskets.