Factory red bellhousing ?

I took quite a few 64, 65 & 66 Barracudas and Darts apart through the years. All of the bellhousings I remember were completely painted.

To the question about switching from the small to larger aluminum bellhousing:
To convert early A-body 9" bellhousing to 10-1/2" clutch & bellhousing (numbers 2843887, 2892482 and 3515734)
Clutch Fork - use a 1966-UP B/E/1967-69 A BIG BLOCK/1970-4 E/1971-4 B SM/BIG BLOCK 10-7/8" OAL
Clutch fork pivot - from 63-66 small block bellhousings with casting numbers 2463027, 2465523, 2468433.
You will have to modify the Z-bar pivot so it lines up with the frame pivot and modify the later Zbar to fit or purchase the swap parts from Brewers.