Some Basic Questions on Clutch/Tranny Upgrades

[HeavyHauler]

Hey guys, eventually I would like to put together what I would consider the "ultimate towing truck" and before I start toting heavy loads, I know that I'm gonna need a better clutch. I have a 5-speed by the way.

I'm running the EZ and 1.6's right now and the clutch is fine but if I start abusing it by hooking to big loads, I figure I'll start to have problems.

I'm looking at either a SBC Con FE or (if I can swing it) a SBC Dual Disk. I'd really like to go with the DD because of the durability but I'm not sure if it's worth the money. Here's the questions:

1) Is it really worth the $700 to install the 1 3/8" input shaft? I know that I'll have to do this if I go the DD route, but if I went with your basic Con FE, would I really need it?

2) If I do upgrade to the 1 3/8" input shaft, does this mean that I then need to buy a clutch for the 6-speed? i.e., a MU1947 version instead of the MU13-1.25 variety? I notice that the 6-speed clutches are a little cheaper.

3) While I have all this going on, would it be best to install a fully splined mainshaft with the updated 5th gear nut from Standard Transmission? I don't want to have a problem with this in the future, and would it be fairly easy to do this upgrade while I'm installing a clutch?

4) Finally, is a DD clutch "too much clutch" for the setup that I'm running right now? I'll probably be at this power level for a year or more before I get everything else done so what do you think?

Ultimately, I'll have a set of towing twins, an adjustable TST, and whatever EDM's Don recommends to use with my setup.

Please bear in mind that I do want to have the best possible setup for the truck. Cost is definitely a concern, but if there's a chance that I might have problems with something down the road, I would like to fix it now.

Thanks for the help once again guys!