351c header fitting issue

I've got a 69 Mustang coupe and have been trying to get a set of Hedman headers to fit. The car had a unknown brand on it when I bought it 6 years ago but they are all dented and rusted, but fit great. My exhaust has been hooked up to these for 3 years. Now that the car is totaled striped down for paint, I'd like to get the new headers in. I have verified that I have the correct Hedmans for a 69 coupe with a 351c 2V. The fit issue is at the collector on the driver side only. It is virtually right against the floorpan, not including he flange. The passenger side has enough clearance. I have the correct motor mounts for a coupe...it did have the convertible mounts. I believe there is only one trans mount for a C4. Raising the motor 1" above the engine mounts gives me about 1/4" clearance back at the collector, so that's not the answer. Assuming Hedman builds these in a jig.

Are there different frame mounts? Since this 351c ( which is a 72...don't know if from a Mustang or ? ) was in the car when i bought it, I have no idea what parts came from what car/year.

Thanks......that may be what the old ones are. Unfortunately the Hedmans are new...I would have returned them if I hadn't painted them. I have plenty of clearance everwhere but the tip of the collector.

Thanks for the reply, but they are for a 69/70. I guess I will build a jig with the old one that fits and get the new header torched and bent to fit. Someone said to stick a big old bar in there and bent it down but that seems like a last resort.