What you're looking for is a girder - I've seen many 70's amen savior framed bikes with girders - google - Durfee girder front end.

There was even someone here 7-8 yrs ago with one. No idea if it had a disk or not. Good luck on the project. And pics please.

PS: This looks a beaut.
http://www.spartanframeworks.com/Forks/Girders.shtml

Cool.
Srinath.

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Like srinath, my clear preference is for the girder. That said, I would argue that the springer does in fact play well when done right on the Savage. And if you were just a bit closer, we'd cobble one of those girders I have out on the shop onto your bike.

https://www.youtube.com/watch?v=nbuTXjslggU&t=10s

Add shims to turn limiters?

This came up not 10 miles away. Columbia SC craigslist. $1750.

https://columbia.craigslist.org/mcy/d/lexington-vintage-cl450-chopper-old/714268
5566.html

Not too shabby IMHO, but I'd have raked it further to get the original motor stance which I believe was vertical not canted back.

Pics - in case the ad gets pulled.

Cool.
Srinath.

More pic

I think I have enough contacts to make a "kit" for something like this -
http://www.spartanframeworks.com/Forks/Girders.shtml

Its not going to be welded but will require minimal welding, and it may be a bit open to shock choice/rake choice caliper location - BTW that design IMHO is likely to break at a few of those welds. As good a welder is, if they leave a weld open to pure shear like the tops of the springs IMHO is a disaster waiting to happen.
I'll build it so the thing will stay in place even if there were no welds - almost 100% bolted together. Cos I am an engineer - a civil engineer and not a welder.

I'd also like to get it completely adjustable for rake and wheel base with just shock and dog bone choice.
I'll also try to build it around an easy to find used shock, like a Katana 600 so you have a lot of applicable swappers cos all rear shocks off nearly all monoshock bikes made ad-nauseum will fit with minimal dog bone mods.
And dog bones being adjustable with many holes will do it some real good too.
This is a good product that's missing a few easy options and complicates a few things unneccessarily.

Cool.
Srinath.

I'm shooting for something in the $5-600 range - with finishing and welding left to the buyer.
Also the non weld needed parts will be made with stainless.
The welding will be minimal and the bike would roll and be transportable on trailers etc.
That way you assemble it at your garage and trailer it to the muffler shop.
Heck I'm hoping it will actually run pretty well to test ride it without welding, because once you weld it it may be not adjustable for rake, trail (independent of rake) etc.
It will be fit to a savage wheel and brake. Drilling may be required for brake fitment the way I have it designed.
Rest assured $1000 isn't going to be breached. But shock would need to be bought as is welding and brake line and a few other nic nacks. But savage front wheel, disk and caliper are to be reused.

Cool.
Srinath.