It is a shame you are so far away. I would be in the mood to build a set for you by monday if you lived closer to michigan. However, you may find that an old 70's chevelle or skylark header picked up at a swap meet may fit ok with your set up, you never know. Go on that site I mentioned previously to find out what you need for your engine / chassis set up, as for diameter and length primarys, then you will increase you odds of getting a set cheap at a swap meet or equal. Custom pipes are worth what you pay for and seldom are under $2000 with collectors if they are any good. A weld up kit comes primitive, but likely will fit out of the box with the pipe uncut in a tube car. Yours would require more effort. Re-fabing one pipe per side on a new out of the box set is much less expensive than doing all 8 primaries custom................ Some say that a monkey can weld with a MIG. Tig requires more skill to do it well.
Bruce