It will be ok the mini's DME will learn and alter it's fuelling and timing to suit.
The only time you really really need a map is when you start to run bigger injectors, head and cam.
But a map can be a good thing anyway 1320 mini mynes fa53 is the best out there and the guys are good.
If it has a reduced pulley make shore it has a better intercooler, it's ok in this weather but come the summer it will suffer and depending on what size pulley it is could trash the pistons.
There are so many different size pulleys you will need to find out what size, as when you need to replace the belt for the supercharger they come in different lengths. Normally people go for 15 or17% pulley
Spark plugs should be changed to a different spec normally they run a heat range no6 you will need a 7
Hope thus helps