RS4 clutch should do pretty well for you, but don’t expect it to hold under a really hard launch with good tires. I was slipping a Southbend Stage 3 with good tires. Since then I upped to the Soutbend Stage 5 and never had it slip.
I’ve got 034 street density engine, trans mounts, snub mount, stern rear diff plate bushings and the apikol rear diff mount in mine. Really stiffened up the drivetrain nice.
Just ordered most of those parts for my 200 the other day actually too.