I'd agree with the coments above, the last engine I built was a fire breathing 1275 early A-Series it had everything fitted to it what I consdiered to be the ultimate 5 port engine. There are some notable draw backs as follows
1/ Driving around town is not very pleasant, in heavy traffic the clutch gets very hot as the engine has no bottom end torque so you need to rev it to pull away
2/ To get the best out of the car you have to drive it like you stole it, with these cars you push all the power to the top of the rev range and as such you need to drive accordingly
3/ Reliability becomes an issue when you tune it to the max more oil changes etc
4/ The mini gearbox will prevent you from outpacing most modern cars as you can get a quick start only to be quickly overhauled as you run out of gears or talent
My advice aim for something driveable your find the experience better and cheaper on the insurance