I want to run a 35 Shot on my GTS and I would like to use the ZEX kit , but I Don't want to run a 55 Shot. Can I use NX shark nozzles on a ZEX kit ? Would it be safe to run a 55 Shot on a STOCK GTS block???
yes it's safe to run a Zex 55 shot on a stock GTS block, but just follow the instructions and use two heat range colder plugs and higher than 91 octane gas.
I wouldn't mix and match kits as that's risky even if the jets do fit. You'd have to monitor the resulting A/F ratios if you did and risk damaging something in the test.