Can I use B or C body manifolds fore better flow on my sleeper GTS?

Much appreciated gentlemen!

I will begin the hunt. I have an extra floor shift column to cut on so that is not a big deal. Thanks for that tip.

I have been really trying hard to keep myself from buying some sort of header. Something about the cast manifolds disarms the unsuspecting.

I also looked at accurate for head pipes. $650 for 2.25" head pipes? Not happening lol. That is TTI header territory right there.