My MSD wires are awesome.
The coils however, no.
A stock belt tends to a be a tad loose on a 3.4" IMO...too much give for me, you can also use the stock belt and upgrade to a Bonneville idler and give it more belt wrap, not that a 3.4" really spins fast enough to slip anyways.
T-Stat, 180*.
If you haven't done LIM gaskets and flush out the dexcool I'd do that as well...and port that blower when you put the 3.4" on.