A little FYI for you, if you have a transmission with the small front bearing retainer (307 bearing) you can still use the easier to find (cheaper?) 68-69 cast "626" bell housing if you use Brewer's "adapter" front bearing retainer "BR-695 BEARING RETAINER 4.805" DIAMETER 307 BEARING 23 SPLINE NEW CAST IRON" available here......http://www.brewersperformance.com/products.asp?cat=228. A moot point if you have a transmission with the larger front bearing retainer already.
Jess
a little FYI for you ... 68 and 69 are different bell housings , one is 626 , the other is 262 ... last 3 digits of casting number ... the 68 doesn't have the 3 speed pattern on it , the 69 does ... Both require a 143 tooth flywheel.
