351 Long Tube Headers

Right on.

Also, I almost forgot, I found that the fox longtube BBK 351 swap headers should work if you convert to a fox input shaft, fox bellhousing and don't run heads with 3/4" raised ports. When i mocked them up ,the driver side was hitting the clutch fork and the passenger side was just touching the floorpan.

Stock K-member and Stock motor mounts.
 
Perfect. Yeah i think im going to use a 1 7/8 header and 3" Primary....but im going to create a pipe that necks down to 2.5. So in the future if i ever want to go 3" on the Exhaust it will just be a matter of unbolting the adapting pipe. Ive got more to worry about with heads and tuning than the 2.5" exhaust. My exhaust system well benefit greatly from not having 1 5/8 swap headers on.
 
I know i am late to this thread, but.... I installed a 410 in my SN-95 with CNC'd Highports and had a tough time finding headers to fit. The taller deck and raised ports made for some issues. I wanted to go the longtube route and actually got some fox BBK 351 swap headers... They did not fit at all. Then, I was turned on to the Anderson/Bassani 1 3/4" shorty big tube headers... Decided to try them out and they fit with some persuasion. Great quality and decent price without the headache and price of custom longtubes.
Just food for thought.

Hey......What be up????:D