To TheShoer,
You want a 621 type bellhousing for a v8 which has the large starter bulge. See;
http://www.stovebolt.com/techtips/engines/bellhousings.html, but there a bunch of aluminum bellhousings out there that will work as well or better since you have to fab up everything anyway. I don't have a number list for the aluminum ones, but it should be on line.
To padresag (Ron),
I can't answer that, but I believe it is more based on application and engine than year. Most '60s 'Vettes used a "small hole" bellhousing with a 153t flywheel for a 10 1/2" clutch until about 1967, except the 427. The 6 cyl trucks from the same period with Muncie transmissions had the big hole to fit the trans and 160t 11" clutches. Go figure.
best wishes,
Les
