If you use a modified cvh engine mount on the engine it pretty much drops straight in & bolts straight up.
One thing you may want to look at as well whilst your planning things is swapping the gearbox to a rear starter ib5, you can use the standard gearbox but with the 170 running a rear starter as standard you need to attack the sump with the grinder to create space for the starter to be mounted on the front so we found it was neater to use rear starter box.

Mark.