I have a few questions for my 1970 dude.
1. What headers work best with a big block?
2. What four speed and pistol grip shifter work best for an 833?
3. What's a better fuel tank system other than the in cab tank?
4. What to do with the front susp. And brakes while retaining the straight axle?
5. Also which oil pan? Aftermarket or stock
6. Any repro dash pads or door panels?
7. Who makes the best aftermarket rust repair?
I'm sure there will be more as I am new to the sweptlines. Thanks guys!!!

My 64 has a rear crossmember shaped for mounting a spare. A '73 Newport gas tank will nestle in there, but I need to add a crossmember to support one end of the tank.

Spectra Premium has a huge selection of gas tanks and you can troll the pages looking at dimensions.
If you can stand to put a hole in the side of the bed, a F150 or Bronco tank will fit back there, too.

Measure twice, cut once!

R.

Scarebird has the kit to add disk brakes to your spindles. Sometimes they sell them on the 'bay.

Thank you guys! Your time is greatly appreciated!

Headers should be easy. My buddy used car headers on his. Thees plenty of room so most should fit. I see a company called Exline making lots of body parts for these trucks. I have not used them but their Webpage shows many available.

I have a 64 sweptline I'm putting a BB in. This what I've learned so far...oil pan is easy...front sump is stock... rear sump will work too. Don't use a center sump.

Stock..the BB sweptys used center dump manifold on both sides. For headers the cheap full size headmans seem to work....but I'm going with the stainless shorty style headers.. they can be had on eBay for under $200. They exist more like stock and seem to give more clearance (I'm willing to give up a little power for clearance).

The disk brake kit mentioned above is the cheapest way to go. Sid's makes a drop front axle too.

I'm installing a 833 OD trans and plan on using a shifter from a mid/late 70's truck. I already bought it but don't know about fit yet. Its meant for a truck... so I would think its my best bet. Its not a pistol grip...but its a Hurst unit...swap the ugly stock knob for a hurst ball for looks.

Not all years big block used both center dump manifolds. How are you going to mount the trans since a cross member was not used until 69, the early trans just hung out on it's own.

I'm pretty sure all the earlier swept lines used the center dumps... not sure about the later ones.

Someone had already put a trans cross member in my truck and had cut and removed part of The old bell crossmember.