For most street applications, it doesn't take much to get a 727 to handle 600 horse. What are your plans for the 600 horses? Street, track, combo?
I agree. Post your application/plans/etc.
But to get things started, I suggest.
1) Good quality clutches. Borg Warner, Raybestos, Alto Red Eagle
2) Have them replace all the bushings now. Then it may never need them again (except the converter bushing might need replacing again). Added labor will apply.
3) Have them replace all the thrust washers now. Again, they will last a long time. Parts are inexpensive, and no added labor.
4) I prefer the driveshaft seal with the dust boot. Most kits only come with a lip seal and no dust boot.
5) A little more line pressure than stock. At least turn up the factory valvebody regulator some. Shift kits typically recommend this. An aftermarket valve body typically is already higher pressure.
