Having built 30+ CT70's in my collection with aftermarket 12v engines.....you would not regret going with the 140.
The "webllc" harness makes the wiring a 15 minute job. Everything is plug and play.
You do not need an oil cooler with the 140.
I always use the original pegs. Space them down 5/8" and you're good to go.
I use the original exhaust, if I have it, or the $60 eBay knockoff. I prefer a stock look.
Just my $.02,
Mike