Tim
Keep in mind if you are looking for a 289 block you have a far larger transmission choice with a 6-bolt block (ie: Post 1964.5 yr) as the 5-bolt block requires a different bellhousing and the T10 has an early bolt pattern unlike the T10 associated with 6-bolt block.
I have an early T10 and need a 5-bolt block which is limiting. Good for authentic discussion however limiting with engine choice. Hindsight being 20/20 I would have went toploader or later T10 as 289/302's with 6-bolt block are easier to come by.
Best in your decision...
