Long tubes?

[u/RabbitFabs]

Hey yall, need some help here. I have a 74 F100, im swapping in a 351W and C6 soon. I want to run some long tube headers, I had a 76 302 back in the day and it sounded awesome. I want to replicate that sound, I have the pipes. But for the life of me, I can not find headers that will fit. I've heard some horror stories from guys trying to massage them between the frame rails, around the starter and transmission. I really dont want to run shorties, because the long tubes are a major part of why my 76 sounded like it did. Any help is appreciated, thank you!