V8 Swap-Engine and Trans Crossmember questions

[BurgerMan]

So I pulled out the 235 and trans, and I want to put my 350/t350 into my 59.

I found this crossmember set on eBay that looks like it is exactly what I need, cept I haven't found the information on installation. I've searched, but I'm not a big fan of the search function on the site.

http://www.ebay.com/itm/261232173575...84.m1438.l2649

Here's my questions:

1) what are peoples thoughts that are using something like this? Are there other options? I Like the idea of the mount going from frame rail to frame rail.
2) does this require the removal of the original trans crossmember where the old bell housing was bolted?
3) where should I start with the placement of the mounts? Engine and trans are bolted together, so obviously start with engine and then place the rear. And once that's figured out do I....
4) weld them in or bolt them in?
5) will I have issues with headers or inner fenders?

Here is a little more info that might be helpful. I currently have the cab at another location where we're doing the body work. It's -7 outside with a foot of snow, so I can't imagine I'll have the ability to have the cab in place to check the clearance. I took pictures and the harmonic balancer of the 235 sits right in line with the front crossmember. Is that where I should start? Will there be a weird gap between firewall and engine since the 350 is shorter?

Sorry for all the questions and my random thoughts.