I converted my '72 LeMans from an auto to a manual last summer. Yeah, it was some work and took a couple bucks, but it is so much fun to run through the gears now.
Even though I installed a 5spd, I still installed a mechanical clutch (Centerforce DF) and Lakewood scattershield that are the same exact components used for 4spd cars. I bought most of the parts I needed to do the conversion from Performance Years (the company that sponsors this forum). PY didn't have the pedals I needed, but I think they offer a set that would fit your car along with just about all the other linkage you'll need.
I've got D-port heads on my car and run Doug's headers and have no clutch linkage clearance issues.
Good luck!
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'72 LeMans 2Dr Hardtop
My first car, purchased in 1980
468 Stroker / KRE 315 / HR cam by SD Performance, Tremec TKO II 5spd
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'96 Corvette Grand Sport (#470 of 1000 built)
Mildly modded LT4, 6spd
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'07 Corvette Z06
Mildly modded LS7, 6spd
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'67 Chevelle Convertible
LS6 (405HP Z06), 700R4
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