Headers for a 66 4 door

Been trying to locate replacement headers for my 66 four door.

Everwhere I call they cant tell me the headers will work for my application because of the trans

Its a 327, th350 and I beleive the headers to be these:http://www.summitracing.com/parts/HED-68160/

When I talked to the summit tech, who was pretty rude and obnoxious he said their book said it wont work because I have a th350

I called the place that these headers were purchased ( I have all the receipts) from and gave them the information and that guy says it should be ok.

Anyone have any input? My receipts are from 2002 so Im not sure if those are the actual parts on the car

If it helps I have a 168 tooth flywheel according to the receipts

Thanks