The 160 is way too much engine for this plane IMHO. Folks fly 1/4 scale acrobatic planes with that engine. Plus the fact that they can be funky when inverted. Especially when your tank is mounted so high like it will have to be. The FI version may not be as bad,, I've never had one of those so I'm not 100% sure. Mine flew fine with the OS91FX but needed a full pound of weight at the nose.
My days of warbirds and two stroke engines are over. The sound of a big 4 stroke will convence you of that.
Scott Ellingson from Brillelli Engines is going to make my carb, stack and muffler extentions narrower on some future projects which will keep me from butchering anymore cowlings. I'd never do that to a true kit build scale warbird. But as many have pointed out,,, the CMP Spit lacks quite a bit from being very scale. It's a short,fat looking Spitfire compared to the real deal. But if you CG it right it can be one of your best flying knock around birds in the hanger.
If you want to keep the scale look with a clean engine mount as Richard did ,, go with a 4-stroke. The YS engines come ready to go with a pressurized fuel system so the tank height doesn't matter. On my Saito's mounted inverted I use the Cline demand regulator and check valve . This keeps the fuel from flooding the engine between runs and draws from the tank only when the carb needs the fuel. The pressure is obtained from the muffler on the 4-strokes and from the crankcase on the 2-strokes.

Hope this helps. There are several tips and mods for these CMP planes here in the WBs forum you should look over. The planes may be lower priced than others,, but you are going to spend more hours fabricating , beefing up everything (especially the firewall) and basically making straight what was mis-aligned from the factory. My last CMP (the FW190) didn't have a single control surface or wing mount area that was flush or the same diameter. I had to sand and resheet both ailerons and flap surfaces just to get a flush fit. Plus the wing was way too big for the saddle. If your Spit is like my old GSP 72" Spitfire then you'll at least get a decent fabric type covering. Mine's lasted for years now after painting and clear coating.

One last tip on this plane. Program your elevator rates so you'll have at least one setting with the bare minimum throws.
Just a dab will do it . Very , very touchy.